Aniseikonia
Lenses
Epiretinal Membrane
Ocular Physiological Phenomena
Diagnosis, Computer-Assisted
Refractive Errors
Encyclopedias as Topic
Distance Perception
Saccade amplitude disconjugacy induced by aniseikonia: role of monocular depth cues. (1/16)
The conjugacy of saccades is rapidly modified if the images are made unequal for the two eyes. Disconjugacy persists even in the absence of disparity which indicates learning. Binocular visual disparity is a major cue to depth and is believed to drive the disconjugacy of saccades to aniseikonic images. The goal of the present study was to test whether monocular depth cues can also influence the disconjugacy of saccades. Three experiments were performed in which subjects were exposed for 15-20 min to a 10% image size inequality. Three different images were used: a grid that contained a single monocular depth cue strongly indicating a frontoparallel plane; a random-dot pattern that contained a less prominent monocular depth cue (absence of texture gradient) which also indicates the frontoparallel plane; and a complex image with several overlapping geometric forms that contained a variety of monocular depth cues. Saccades became disconjugate in all three experiments. The disconjugacy was larger and more persistent for the experiment using the random-dot pattern that had the least prominent monocular depth cues. The complex image which had a large variety of monocular depth cues produced the most variable and less persistent disconjugacy. We conclude that the monocular depth cues modulate the disconjugacy of saccades stimulated by the disparity of aniseikonic images. (+info)Disconjugate oculomotor learning caused by feeble image-size inequality: differences between secondary and tertiary positions. (2/16)
In order to examine the minimum value of image-size inequality capable of inducing lasting disconjugacy of the amplitude of saccades, six normal emmetropic subjects were exposed for 16 min to 2% image size inequality. Subjects were seated at 1 m in front of a screen where a random-dot pattern was projected and made saccades of 7.5 and 15 deg along the horizontal and vertical principal meridians and to tertiary positions in the upper and lower field. During the training period, compensatory disconjugacy of the amplitude of the saccades occurred for the principal horizontal and vertical meridians; such increased disconjugacy persisted after training, suggesting learning. In contrast, for horizontal saccades to or from tertiary positions made in the upper and lower field, no consistent changes in the disconjugacy occurred, either during training or after the training condition. In an additional experiment, three subjects read sequences of words with the 2% magnifier in front of their dominant eye: in such a task, horizontal saccades to or from tertiary positions at the upper or lower field showed appropriate and lasting disconjugacy for two of the three subjects. We conclude that even a 2% image size inequality stimulates oculomotor learning, leading to persistent disconjugacy of saccades. The small disparity created by the image-size inequality is thus compensated by the oculomotor system rather than tolerated by the sensory system (e.g. by enlarging the Panum's area). (+info)Differences in tests of aniseikonia. (3/16)
The New Aniseikonia Test (NAT), a hand-held direct-comparison test using red/green anaglyphs, has several potential advantages as a screener. We compared the validity of the NAT to that of the Space Eikonometer in three experiments: (1) aniseikonia was induced by calibrated size lenses in a double-blind study of 15 normal subjects; (2) habitual aniseikonia was measured with both instruments in four patients; and (3) eight of the normal subjects were retested with a computer-video simulation of the NAT. The NAT underestimated induced aniseikonia by a factor of 3 in the normal subjects and underestimated habitual aniseikonia in four patients. The Space Eikonometer correctly measured the magnitude of induced aniseikonia in the normal subjects. The simulation test did not show underestimation in the eight normal subjects. We could not attribute the NAT's underestimation of aniseikonia to the red/green anaglyph method, printing error, psychophysical method, or the direct-comparison test format. We speculate that the NAT induces a different sensory fusion response to aniseikonia than do the other tests, and that this altered sensory fusion response diminishes measured aniseikonia. We conclude that the NAT is not a valid measure of aniseikonia. (+info)Aniseikonia associated with epiretinal membranes. (4/16)
AIMS: To determine whether the computerised version of the new aniseikonia test (NAT) is a valid, reliable method to measure aniseikonia and establish whether aniseikonia occurs in patients with epiretinal membranes (ERM) with preserved good visual acuity. METHODS: With a computerised version of the NAT, horizontal and vertical aniseikonia was measured in 16 individuals (mean 47 (SD 16.46) years) with no ocular history and 14 patients (mean 67.7 (14.36) years) with ERM. Test validity was evaluated by inducing aniseikonia with size lenses. Test reliability was assessed by the test-retest method. RESULTS: In normal individuals, the mean percentage (SD) aniseikonia was -0.24% (0.71) horizontal and 0% (0.59) vertical. Validity studies revealed mean (SD) 0.990 (0.005) horizontal and 0.991 (0.004) vertical correlation coefficients, 0.985 (0.111) horizontal and 0.989 (0.102) vertical slope. Repeatability coefficients were 1.04 horizontal and 0.88 vertical. Aniseikonia in patients with ERM ranged from 4% to 14%. Eight patients showed 2% or more size difference between horizontal and vertical meridians. CONCLUSIONS: The aniseikonia test used in this study can be considered a simple, fast, valid and reliable method to measure the difference in image size perceived by each eye. Aniseikonia does occur in symptomatic patients with ERM. The effect of ERM on image size is heterogeneous across the retinal area affected. (+info)Validity and repeatability of a new test for aniseikonia. (5/16)
PURPOSE: The Aniseikonia Inspector 1.1 (AI) is a new software product to measure aniseikonia using red-green anaglyphs. The purpose of this study was to test whether the AI is a valid and reliable test. METHODS: There were two groups of sample subjects: one at risk of aniseikonia, with anisometropia greater than or equal to 1.00 D (n= 29), and a control group (n= 45). The validity was studied by comparing the measured aniseikonia with the aniseikonia simulated with size lenses. The reliability was estimated by the Bland-Altman statistical method. RESULTS: The results showed that the AI underestimated aniseikonia and that the underestimation was greater in the horizontal than in the vertical direction. The reliability was low, with biases that were clinically insignificant, but the 95% limits of agreement were around +/-2%. The behavior of the test was similar in both groups of subjects. CONCLUSIONS: The reliability of the AI is only moderate, and professionals are therefore warned to use the results of this test with caution. (+info)Effect of aniseikonia on fusion. (6/16)
Physiological aniseikonia is the basis of stereopsis but beyond certain limits it becomes an obstacle to fusion. It is not well established as to how much aniseikonia can be tolerated by the fusional mechanism. Different tests under different testing conditions have given a wide range of variation. On the synoptophore we had observed tolerance upto 35% aniseikonia in some cases. Under more physiological conditions on a polaroid dissociation stereoprojector we observed lesser baseline fusional vergences but tolerance in about 70% of the cases upto 30% aniseikonia while 25% could tolerate even 35% aniseikonia. However we realise that these indicate the maximal potential and not the symptom free tolerable limits. (+info)Magnifications of single and dual element accommodative intraocular lenses: paraxial optics analysis. (7/16)
(+info)The effect of lens-induced anisometropia on accommodation and vergence during human visual development. (8/16)
(+info)Aniseikonia is a medical term that refers to a condition where there is a significant difference in the size or shape of the images perceived by each eye. This occurs when there is a disproportionate amount of magnification or minification between the two eyes, leading to a mismatch in the visual perception of objects' size and shape.
Aniseikonia can result from various factors, including anisometropia (a significant difference in the refractive power between the two eyes), cataract surgery, corneal irregularities, or retinal diseases. It can cause symptoms such as eyestrain, headaches, and difficulty with depth perception, reading, and overall visual comfort.
Treatment for aniseikonia typically involves correcting the underlying refractive error with prescription lenses, prisms, or contact lenses. In some cases, surgical intervention may be necessary to address any structural issues causing the condition.
Vision tests are a series of procedures used to assess various aspects of the visual system, including visual acuity, accommodation, convergence, divergence, stereopsis, color vision, and peripheral vision. These tests help healthcare professionals diagnose and manage vision disorders, such as nearsightedness, farsightedness, astigmatism, amblyopia, strabismus, and eye diseases like glaucoma, cataracts, and macular degeneration. Common vision tests include:
1. Visual acuity test (Snellen chart or letter chart): Measures the sharpness of a person's vision at different distances.
2. Refraction test: Determines the correct lens prescription for glasses or contact lenses by assessing how light is bent as it passes through the eye.
3. Color vision test: Evaluates the ability to distinguish between different colors and color combinations, often using pseudoisochromatic plates or Ishihara tests.
4. Stereopsis test: Assesses depth perception and binocular vision by presenting separate images to each eye that, when combined, create a three-dimensional effect.
5. Cover test: Examines eye alignment and the presence of strabismus (crossed eyes or turned eyes) by covering and uncovering each eye while observing eye movements.
6. Ocular motility test: Assesses the ability to move the eyes in various directions and coordinate both eyes during tracking and convergence/divergence movements.
7. Accommodation test: Evaluates the ability to focus on objects at different distances by using lenses, prisms, or dynamic retinoscopy.
8. Pupillary response test: Examines the size and reaction of the pupils to light and near objects.
9. Visual field test: Measures the peripheral (side) vision using automated perimetry or manual confrontation techniques.
10. Slit-lamp examination: Inspects the structures of the front part of the eye, such as the cornea, iris, lens, and anterior chamber, using a specialized microscope.
These tests are typically performed by optometrists, ophthalmologists, or other vision care professionals during routine eye examinations or when visual symptoms are present.
In the context of medical terminology, "lenses" generally refers to optical lenses used in various medical devices and instruments. These lenses are typically made of glass or plastic and are designed to refract (bend) light in specific ways to help magnify, focus, or redirect images. Here are some examples:
1. In ophthalmology and optometry, lenses are used in eyeglasses, contact lenses, and ophthalmic instruments to correct vision problems like myopia (nearsightedness), hypermetropia (farsightedness), astigmatism, or presbyopia.
2. In surgical microscopes, lenses are used to provide a magnified and clear view of the operating field during microsurgical procedures like ophthalmic, neurosurgical, or ENT (Ear, Nose, Throat) surgeries.
3. In endoscopes and laparoscopes, lenses are used to transmit light and images from inside the body during minimally invasive surgical procedures.
4. In ophthalmic diagnostic instruments like slit lamps, lenses are used to examine various structures of the eye in detail.
In summary, "lenses" in medical terminology refer to optical components that help manipulate light to aid in diagnosis, treatment, or visual correction.
An epiretinal membrane, also known as a macular pucker or cellophane maculopathy, is a thin and transparent layer of tissue that forms over the macula (the central part of the retina responsible for sharp, detailed vision) in the eye. This membrane can contract and wrinkle the macula, distorting central vision.
Epiretinal membranes are typically caused by the migration and proliferation of glial cells or other cell types onto the surface of the retina following retinal injury, inflammation, or aging. In some cases, they may be associated with other eye conditions such as diabetic retinopathy, retinal vein occlusion, or age-related macular degeneration.
Mild epiretinal membranes may not require treatment, but if the distortion of vision is significant, a vitrectomy surgery may be recommended to remove the membrane and improve visual acuity.
"Ocular physiological phenomena" is not a standardized medical term with a specific definition. However, I can provide some examples of ocular physiological phenomena, which refer to various normal functions and processes that occur in the eye. Here are a few examples:
1. Accommodation: The ability of the eye to change optical power to maintain a clear image or focus on an object as its distance varies. This is primarily achieved by changing the curvature of the lens through the action of the ciliary muscles.
2. Pupillary reflex: The automatic adjustment of the pupil's size in response to changes in light intensity. In bright light, the pupil constricts (miosis), while in dim light, it dilates (mydriasis). This reflex helps regulate the amount of light that enters the eye.
3. Tear production: The continuous secretion of tears by the lacrimal glands to keep the eyes moist and protected from dust, microorganisms, and other foreign particles.
4. Extraocular muscle function: The coordinated movement of the six extraocular muscles that control eyeball rotation and enable various gaze directions.
5. Color vision: The ability to perceive and distinguish different colors based on the sensitivity of photoreceptor cells (cones) in the retina to specific wavelengths of light.
6. Dark adaptation: The process by which the eyes adjust to low-light conditions, improving visual sensitivity primarily through changes in the rod photoreceptors' sensitivity and pupil dilation.
7. Light adaptation: The ability of the eye to adjust to different levels of illumination, mainly through alterations in pupil size and photoreceptor cell response.
These are just a few examples of ocular physiological phenomena. There are many more processes and functions that occur within the eye, contributing to our visual perception and overall eye health.
Computer-assisted diagnosis (CAD) is the use of computer systems to aid in the diagnostic process. It involves the use of advanced algorithms and data analysis techniques to analyze medical images, laboratory results, and other patient data to help healthcare professionals make more accurate and timely diagnoses. CAD systems can help identify patterns and anomalies that may be difficult for humans to detect, and they can provide second opinions and flag potential errors or uncertainties in the diagnostic process.
CAD systems are often used in conjunction with traditional diagnostic methods, such as physical examinations and patient interviews, to provide a more comprehensive assessment of a patient's health. They are commonly used in radiology, pathology, cardiology, and other medical specialties where imaging or laboratory tests play a key role in the diagnostic process.
While CAD systems can be very helpful in the diagnostic process, they are not infallible and should always be used as a tool to support, rather than replace, the expertise of trained healthcare professionals. It's important for medical professionals to use their clinical judgment and experience when interpreting CAD results and making final diagnoses.
Binocular vision refers to the ability to use both eyes together to create a single, three-dimensional image of our surroundings. This is achieved through a process called binocular fusion, where the images from each eye are aligned and combined in the brain to form a unified perception.
The term "binocular vision" specifically refers to the way that our visual system integrates information from both eyes to create depth perception and enhance visual clarity. When we view an object with both eyes, they focus on the same point in space and send slightly different images to the brain due to their slightly different positions. The brain then combines these images to create a single, three-dimensional image that allows us to perceive depth and distance.
Binocular vision is important for many everyday activities, such as driving, reading, and playing sports. Disorders of binocular vision can lead to symptoms such as double vision, eye strain, and difficulty with depth perception.
Intraocular lenses (IOLs) are artificial lens implants that are placed inside the eye during ophthalmic surgery, such as cataract removal. These lenses are designed to replace the natural lens of the eye that has become clouded or damaged, thereby restoring vision impairment caused by cataracts or other conditions.
There are several types of intraocular lenses available, including monofocal, multifocal, toric, and accommodative lenses. Monofocal IOLs provide clear vision at a single fixed distance, while multifocal IOLs offer clear vision at multiple distances. Toric IOLs are designed to correct astigmatism, and accommodative IOLs can change shape and position within the eye to allow for a range of vision.
The selection of the appropriate type of intraocular lens depends on various factors, including the patient's individual visual needs, lifestyle, and ocular health. The implantation procedure is typically performed on an outpatient basis and involves minimal discomfort or recovery time. Overall, intraocular lenses have become a safe and effective treatment option for patients with vision impairment due to cataracts or other eye conditions.
Refractive errors are a group of vision conditions that include nearsightedness (myopia), farsightedness (hyperopia), astigmatism, and presbyopia. These conditions occur when the shape of the eye prevents light from focusing directly on the retina, causing blurred or distorted vision.
Myopia is a condition where distant objects appear blurry while close-up objects are clear. This occurs when the eye is too long or the cornea is too curved, causing light to focus in front of the retina instead of directly on it.
Hyperopia, on the other hand, is a condition where close-up objects appear blurry while distant objects are clear. This happens when the eye is too short or the cornea is not curved enough, causing light to focus behind the retina.
Astigmatism is a condition that causes blurred vision at all distances due to an irregularly shaped cornea or lens.
Presbyopia is a natural aging process that affects everyone as they get older, usually around the age of 40. It causes difficulty focusing on close-up objects and can be corrected with reading glasses, bifocals, or progressive lenses.
Refractive errors can be diagnosed through a comprehensive eye exam and are typically corrected with eyeglasses, contact lenses, or refractive surgery such as LASIK.
An encyclopedia is a comprehensive reference work containing articles on various topics, usually arranged in alphabetical order. In the context of medicine, a medical encyclopedia is a collection of articles that provide information about a wide range of medical topics, including diseases and conditions, treatments, tests, procedures, and anatomy and physiology. Medical encyclopedias may be published in print or electronic formats and are often used as a starting point for researching medical topics. They can provide reliable and accurate information on medical subjects, making them useful resources for healthcare professionals, students, and patients alike. Some well-known examples of medical encyclopedias include the Merck Manual and the Stedman's Medical Dictionary.
Distance perception refers to the ability to accurately judge the distance or depth of an object in relation to oneself or other objects. It is a complex process that involves both visual and non-visual cues, such as perspective, size, texture, motion parallax, binocular disparity, and familiarity with the object or scene.
In the visual system, distance perception is primarily mediated by the convergence of the two eyes on an object, which provides information about its depth and location in three-dimensional space. The brain then integrates this information with other sensory inputs and prior knowledge to create a coherent perception of the environment.
Disorders of distance perception can result from various conditions that affect the visual system, such as amblyopia, strabismus, or traumatic brain injury. These disorders can cause difficulties in tasks that require accurate depth perception, such as driving, sports, or manual work.
Size perception in a medical context typically refers to the way an individual's brain interprets and perceives the size or volume of various stimuli. This can include visual stimuli, such as objects or distances, as well as tactile stimuli, like the size of an object being held or touched.
Disorders in size perception can occur due to neurological conditions, brain injuries, or certain developmental disorders. For example, individuals with visual agnosia may have difficulty recognizing or perceiving the size of objects they see, even though their eyes are functioning normally. Similarly, those with somatoparaphrenia may not recognize the size of their own limbs due to damage in specific areas of the brain.
It's important to note that while 'size perception' is not a medical term per se, it can still be used in a medical or clinical context to describe these types of symptoms and conditions.
Anisometropia is a medical term that refers to a condition where there is a significant difference in the refractive power between the two eyes. In other words, one eye has a significantly different optical prescription compared to the other eye. This condition can cause issues with binocular vision and depth perception, and can sometimes lead to amblyopia (lazy eye) if not corrected early in life. It is typically diagnosed through a comprehensive eye examination and can be corrected with glasses or contact lenses.
Aniseikonia
Horror fusionis
Refractive error
Epiretinal membrane
Worth 4 dot test
Adelbert Ames Jr.
Knapp's rule
Contact lens
Diplopia
Roger J. Williams
Amblyopia
Suppression (eye)
Anisometropia
Strabismus
List of ICD-9 codes 320-389: diseases of the nervous system and sense organs
Suppression
List of MeSH codes (C11)
Aniseikonia - Wikipedia
Prediction of ocular magnification and aniseikonia after cataract surgery - Open Research Online
Amblyopia - Adult - Shaw Lens Inc. - Aniseikonia Solved
Day S[au] - Search Results - PubMed
How Can I Tell If My Child Has Myopia?
Tratamento da aniseiconia induzida na correção óptica de anisometropia em crianç...
Binocular Vision - Midterm 1 - ProProfs Quiz
Michael Joel Elman, MD| Comprehensive Ophthalmology | MedStar Health
Daniel W Wang, MD| Comprehensive Ophthalmology | MedStar Health
Knowledge Center Archives - Keystone View Vision Screeners
Around the Eye in 365 Days - SLACK Books
Duane syndrome
Greenman Eye Associates - Wimgo
Clinical Services Offered
Diplopia (Double Vision): Background, Pathophysiology, Epidemiology
Opthamology Data (1971-75)
April | 2021 | Ento Key
Blog l EyeDocs Family Eye Care
PAGE FOUR
students - Indiana University School of Optometry News
Jurisdiction J Part B - Cataract Removal
Keratitis - Wikipedia
English Vocabulary Long Words | Longest words in English - Vocabulary Point
Bio2Vec
Bio2Vec
Classifications - PureNext
Cataract extraction. Medical search
Dictionary | Fisher-Swale Eye Center | Eye Care Bourbonnais - Fisher Swale
Static aniseikonia3
- Not only is the static aniseikonia corrected, but the prismatic effect is reduced in the progressive reading zone. (shawlens.com)
- Prescription, motor fusion limits and position of wear details are input into 4 simple screens and the sophisticated SHAW lens algorithm optimizes the lens design for each patient's tolerance to dynamic and static aniseikonia. (shawlens.com)
- There are two types of aniseikonia - static aniseikonia, in which the size of an image is different in each eye, and dynamic aniseikonia, in which the eyes are forced to track vertically and laterally at different rates. (accenteyes.com)
Anisometropia and Aniseikonia1
- To judge the incidence of symptomatic anisometropia and aniseikonia requiring intervention following surgical procedure with mixed pars plana vitrectomy (PPV) and broad 276 model encircling scleral buckle ( ESB ) for the restore of rhegmatogenous retinal detachments (RRD) and to report axial size (AL) and keratometry modifications, a retrospective evaluate of consecutive RRD sufferers handled with mixed PPV and ESB between June 2016 till September 2019 was carried out. (esb2017.org)
Dynamic aniseikonia1
- Included is a direct comparison of binocular field of vision between the SHAW lens and a convention lens (dark blue = adapt, pink = never adapt) and a comparison of static and dynamic aniseikonia (blue bar indicates measured patient limits, dot indicates lens performance within those limits, green = good, yellow = ok, red = bad). (shawlens.com)
Cataract surgery1
- Ocular magnification and aniseikonia after cataract surgery has been widely ignored in modern cataract surgery. (open.ac.uk)
Ocular2
- Aniseikonia is an ocular condition where there is a significant difference in the perceived size of images. (wikipedia.org)
- Despite a strong similarity of both eyes, ocular magnification does not fully match between eyes and the prediction of ocular magnification and aniseikonia might be relevant to avoid eikonic problems in the pseudophakic eye. (open.ac.uk)
Intraocular lens3
- Aniseikonia due to uniocular aphakia is best corrected surgically by intraocular lens implantation. (wikipedia.org)
- Rarely, fusion cannot occur because of dissimilar image size, which can occur after changes in the optical function of the eye after refractive surgery (eg, LASIK) or after a cataract is replaced by an intraocular lens or because of aniseikonia, which represents a discrepancy in image size perceived by the two eyes. (medscape.com)
- All sufferers with symptomatic optically induced aniseikonia requiring further interventions or surgical procedures together with clear lens exchanges, secondary intraocular lens implants or contact lenses have been documented. (esb2017.org)
Retinal4
- citation needed] Retinal aniseikonia occur due to forward displacement, stretching or edema of retina. (wikipedia.org)
- Similarly retinal aniseikonia is corrected by treating causative retinal disease. (wikipedia.org)
- When the disparity appears to vary across the visual field (field-dependent aniseikonia), as may be the case with an epiretinal membrane or retinal detachment, the aniseikonia cannot fully be corrected with traditional optical techniques like standard corrective lenses. (wikipedia.org)
- OBJECTIVES: To compare the aniseikonia and the stereopsis in children of the first-year of elementary school with anisometropia corrected with stock ophthalmic lenses with base curve selected to minimize the interocular size difference of retinal images and with size lenses suggested by the software Aniseikonia Inspector 3, and to check the preference of them for one of these forms of correction. (usp.br)
Binocular1
- It compares the binocular field of view and aniseikonia values from a conventional lens versus a SHAW lens. (shawlens.com)
Astigmatism1
- Meridional aniseikonia occurs when these refractive differences only occur in one meridian (see astigmatism). (wikipedia.org)
Unequal1
- Unequal Images A special study of 400 aviation cadets showed that two out of every 25 men had aniseikonia-a condition which produces unequal images in the two eyes-to the extent of one half of 1 per cent or more. (loc.gov)
SHAW1
- The SHAWâ„¢ lens is designed specifically to solve aniseikonia. (accenteyes.com)
Lens design1
- This patent-pending method solves aniseikonia through sophisticated lens design software that models the physiology of how the individual patient's eyes work in tandem - i.e., how the left eye moves in relation to the right eye in lateral (side to side) and vertical gaze. (accenteyes.com)
Magnification1
- Magnification size matched lenses that are used to correct aniseikonia are known as iseikonic lenses. (wikipedia.org)
Lenses3
- citation needed] Optical aniseikonia due to anisometropia can be corrected by spectacles, contact lenses or refractive corneal surgeries. (wikipedia.org)
- 1.5 D in corresponding meridians, in the use of glasses with stock ophthalmic lenses and with size lenses were evaluated for aniseikonia (software Aniseikonia Inspector 3) and stereopsis (Stereo Fly test with LEA symbols). (usp.br)
- RESULTS: The mean and standard deviations of the vertical and horizontal aniseikonia in the use of glasses with stock ophthalmic lenses and with size lenses were, respectively,-1.05% ± 2.20% and -1.37% ± 2.36% (p = 0,82739) and -0.895% ± 2.23% and -1.16% ± 2.03% (p = 0,77018). (usp.br)
Tolerance1
- Tolerance for aniseikonia. (sciendo.com)
Differences1
- Aniseikonia is a condition characterized by differences in the size of images seen by the right. (eyedocsbrookville.com)
Eyes2
- When this object is viewed with both eyes, it is seen with a small amount of aniseikonia. (wikipedia.org)
- Just one affected person (1%), being pseudophakic in each eyes, had persistent anisometropia/aniseikonia. (esb2017.org)
Correction2
- citation needed] Aniseikonia can occur naturally or be induced by the correction of a refractive error, usually anisometropia (having significantly different refractive errors between each eye) or antimetropia (being myopic (nearsighted) in one eye and hyperopic (farsighted) in the other. (wikipedia.org)
- citation needed] For reducing aniseikonia, similar to contact lens correction, optical image size difference will be reduced in refractive surgeries also. (wikipedia.org)
Difference1
- So this fixes is something called Aniseikonia, and Aniseikonia is the optometric word that describes the image difference and the end results in the inability to put images together in the brain. (brighteyestampa.com)
Condition1
- Aniseikonia is a condition where the image seen by one eye is a different size and shape than the image seen by the other eye. (keystoneview.com)
Significant1
- One cause of significant anisometropia and subsequent aniseikonia has been aphakia. (wikipedia.org)
Software1
- OBJETIVOS: Comparar a aniseiconia e a estereopsia em escolares anisometropes do primeiro ano do ensino fundamental corrigidos com lentes oftálmicas de estoque com curvas-base selecionadas para minimizar a diferença de tamanho interocular das imagens retÃnicas e com lentes iseicônicas sugeridas pelo software Aniseikonia Inspector 3 e verificar a preferência dos escolares por uma destas formas de correção. (usp.br)
Visual1
- AsimetrÃas en la topografÃa e Ãndice de refracción de la superficie corneal que afectan a la agudeza visual. (bvsalud.org)
Research1
- Academy 2022, Dublin Purpose: Research focuses on measuring the degrees of aniseikonia and the su. (eaoo.online)
Anisometropia7
- citation needed] Aniseikonia can occur naturally or be induced by the correction of a refractive error, usually anisometropia (having significantly different refractive errors between each eye) or antimetropia (being myopic (nearsighted) in one eye and hyperopic (farsighted) in the other. (wikipedia.org)
- One cause of significant anisometropia and subsequent aniseikonia has been aphakia. (wikipedia.org)
- For some patients the removal was only performed on one eye, resulting in the anisometropia / aniseikonia. (wikipedia.org)
- citation needed] Optical aniseikonia due to anisometropia can be corrected by spectacles, contact lenses or refractive corneal surgeries. (wikipedia.org)
- Theoretically, anisometropia leads to both defocus in one eye as well as unequal image size (aniseikonia). (hrc.govt.nz)
- Unequal retinal image sizes - a condition called aniseikonia (an-ih-si-KOH-nee-uh) - causes many of the same symptoms as uncorrected anisometropia. (allaboutvision.com)
- Other disorder of refraction and accommodation includes diagnosis codes indicating anisometropia and aniseikonia, disorders of accommodation, internal ophthalmoplegia, paresis of accommodation, or spasm of accommodation. (cdc.gov)
Correct aniseikonia2
- Magnification size matched lenses that are used to correct aniseikonia are known as iseikonic lenses. (wikipedia.org)
- Shaw Lens: The Shaw lens is designed to correct aniseikonia, which is the image size difference appreciated in glasses caused by a large difference in prescription between the two eyes. (insightvisionoc.com)
Refractive5
- Meridional aniseikonia occurs when these refractive differences only occur in one meridian (see astigmatism). (wikipedia.org)
- citation needed] For reducing aniseikonia, similar to contact lens correction, optical image size difference will be reduced in refractive surgeries also. (wikipedia.org)
- In a child with a monocular cataract or with a pseudophakic fellow eye, it is important to determine the refractive status of the fellow eye to minimize the aniseikonia. (aao.org)
- The fourth section of this text cover advanced diagnostic and management issues including discussions of refractive amblyopia, nystagmus, aniseikonia, management of refractive error as well as vision problems associated with computer use and brain injury, learning problems, and refractive surgery. (ovpjournal.org)
- Rarely, fusion cannot occur because of dissimilar image size, which can occur after changes in the optical function of the eye following refractive surgery (eg, LASIK) or after a cataract is replaced by an intraocular lens or because of aniseikonia, which represents a discrepancy in image size perceived by the two eyes. (medscape.com)
Patient's2
- There are several behaviour indications that a patient's glasses may be inducing aniseikonia. (shawlens.com)
- You don't always need expensive proprietary systems to address your patient's aniseikonia. (reviewofoptometry.com)
Aphakia1
- Aniseikonia due to uniocular aphakia is best corrected surgically by intraocular lens implantation. (wikipedia.org)
Retinal image1
- The eikonometer is an instrument to measure aniseikonia, which is a distortion of stereoscopic space due to unequal retinal image sizes. (aco.org.au)
Epiretinal membrane1
- When the disparity appears to vary across the visual field (field-dependent aniseikonia), as may be the case with an epiretinal membrane or retinal detachment, the aniseikonia cannot fully be corrected with traditional optical techniques like standard corrective lenses. (wikipedia.org)
Bannon2
- See Clinical Manual on aniseikonia by Robert Bannon (Cat no 473). (aco.org.au)
- reprints of artlcles by Bannon (Cat No 528 and 529) and Kenneth Ogle's book on Researches on binocular vision (Cat No 509 and 597) for more information about aniseikonia and this instrument. (aco.org.au)
Keratoconus1
- Additionally, there are conditions such as keratoconus and aniseikonia that are better corrected with contact lenses than glasses. (visioneyes.co.za)
Contact lenses1
- By comparison, contact lenses and LASIK surgery produce clear retinal images with little or no discernable aniseikonia. (allaboutvision.com)
Refraction1
- When surgery will be done in both eyes, a larger amount of hyperopia may be acceptable, since aniseikonia can be avoided by targeting a nearly equivalent refraction in both eyes. (aao.org)
Glasses3
- Depending upon the degree of the aniseikonia, and individual tolerance of the condition, traditionally designed glasses can cause headaches , dizziness , eye strain , fatigue and non-adaptation of the glasses. (shawlens.com)
- Headaches and aniseikonia are the subjects of a research grant that we are developing at Shaw Lens Inc. because we believe this problem is prevalent among glasses wearers. (shawlens.com)
- Other signs of aniseikonia with patients wearing glasses. (shawlens.com)
Optics1
- Note however that before the optics can be designed, first the aniseikonia should be measured. (wikipedia.org)
Clinical2
- Following on from this, a clinical pilot study will be completed to assess if correcting for aniseikonia results in better treatment outcomes in children. (hrc.govt.nz)
- Aniseikonia - a clinical report covering a ten year period. (shawlens.com)
Measurements1
- This project aims to accurately measure the extent of aniseikonia in anisometropic amblyopes using subjective and objective measurements. (hrc.govt.nz)
Size4
- Aniseikonia is an ocular condition where there is a significant difference in the perceived size of images. (wikipedia.org)
- Purpose The purpose of this study was to evaluate the validity of the iPad Aniseikonia Test for measurement size lens-induced aniseikonia. (bsz-bw.de)
- Methods Aniseikonia was induced in 21 subjects by means of afocal size lenses. (bsz-bw.de)
- In some cases aniseikonia (condition which results in difference in the size of images as seen by the person) is also a predominant factor leading to binocular diplopia. (targetwoman.com)
Test3
- The iPad Aniseikonia Test is a new computer-based test designed for measuring aniseikonia in vertical direction. (bsz-bw.de)
- Resulting aniseikonia was measured in vertical direction by the iPad Aniseikonia Test. (bsz-bw.de)
- In all cases the iPad Aniseikonia Test underestimates the level of aniseikonia. (bsz-bw.de)
Study1
- Loutfallah, Michael (1938), "Aniseikonia: A Study of 836 Patients Examined with the Ophthalmo-Eikonometer", Trans Am Ophthalmol Soc. (wikipedia.org)
Target1
- A way to demonstrate aniseikonia is to hold a near target (e.g., a pen or a finger) approximately 6 inches directly in front of one eye. (wikipedia.org)