*  Aniseikonia - Wikipedia
Aniseikonia is an ocular condition where there is a significant difference in the perceived size of images. It can occur as an ... Aniseikonia can occur naturally or be induced by the correction of a refractive error, usually anisometropia (having ... When this object is viewed with both eyes, it is seen with a small amount of aniseikonia. The principles behind this ... When the disparity appears to vary across the visual field (field-dependent aniseikonia), as may be the case with an epiretinal ...
*  eyes facts, information, pictures | Encyclopedia.com articles about eyes
aniseikonia, anisoconia a defect of the eyesight in which the images on the retinas are different in size. -aniseikonic , adj. ...
*  Eyes Definition, Prefix, Suffix, Ologies and Isms, Eyes Information and Meaning
aniseikonia, anisoconia a defect of the eyesight in which the images on the retinas are different in size. - aniseikonic , adj ...
*  D. Patrick Kelly, MD | Seattle,WA
D. Patrick Kelly, MD is a specialist in Ophthalmology who has an office at 1101 Madison Street Suite 600 in Seattle, WA and can be reached at 206-215-2020.
*  Michael V. Osetinsky, MD | Everett,WA
Michael V. Osetinsky, MD is a specialist in Ophthalmology, Vitreoretinal Diseases who has an office at 1724 West Marine View DriveSuite 130 in Everett, WA and can be reached at 425-252-2333.
*  Optometry and Vision Science
The correction of static and dynamic aniseikonia with spectacles and contact lenses  McNeill, Suzanne; Bobier, William (Wiley ...
*  vitrectomy - Symptoms, Treatments and Resources for vitrectomy
Aniseikonia after vitrectomies and developing cataract - Eye Care Community - Nov 20, 2015 ...
*  Pathology
Refractive error: Hyperopia/Myopia - Astigmatism - Anisometropia/Aniseikonia - Presbyopia. Visual disturbances and blindness. ...
*  Contact l | definition of contact l by Medical dictionary
aniseikonic lens Lens designed to correct aniseikonia. It can have power like a regular ophthalmic lens but also produces a ...
*  Macropsia - Wikipedia
The Aniseikonia Inspector contains an aniseikonia test based on the same principles as the NAT, but the test is run on a ... the condition is known as aniseikonia. Aniseikonia is known to be associated with certain retinal conditions. Epiretinal ... The New Aniseikonia Test (NAT) can quantify the degree of macropsia or micropsia independently in the vertical and horizontal ... Aniseikonia. Trans Am Ophthalmol Soc. 1938; 36:227-234. Riley, H. D. (2005). Amsler grid testing. Indiana University School of ...
*  Horror fusionis - Wikipedia
Brandenburg KC (September 1935). "Aniseikonia". California and Western Medicine. 43 (3): 188-92. PMC 1753774 . PMID 18743367. ( ... condition was present years after surgerical correction of strabismus acquired during childhood and co-existed with aniseikonia ...
*  Ocular Toxoplasmosis disease: Malacards - Research Articles, Drugs, Genes, Clinical Trials
aniseikonia 10.5. CD40LG CD79A 45. gestational diabetes 10.5. CD40LG CD79A 46. polyneuropathy due to drug 10.5. CD40LG CD79A ...
*  Variation of Binocular-Vertical Fusion Amplitude with Convergence | IOVS | ARVO Journals
The effect of aniseikonia on the amplitude of vertical divergence. Am J Optom Arch Am Acad Optom. 1952;29:403-415. [PubMed] ... aniseikonia) could hamper the subject's ability to fuse the horizontal and vertical disparities. 34 All experimental procedures ...
*  Epiretinal membrane - Wikipedia
de Wit GC (2007). "Retinally-induced aniseikonia". Binocul Vis Strabismus Q. 22 (2): 96-101. PMID 17688418. Benson WE, Brown GC ... creating a localized or field dependent aniseikonia that cannot be fully corrected optically with glasses. Partial correction ...
*  Anisometropia | definition of anisometropia by Medical dictionary
Correction may induce aniseikonia and when the eyes deviate from the optical axes of the lenses, anisophoria. Uncorrected ...
*  How Do I move on after cataract surgery? - Eye Care - MedHelp
Steve Charles in Memphis suggested that peeling the ILM might prevent/resolve the aniseikonia (point 'd' above). So perhaps the ... Steve Charles in Memphis suggested that peeling the ILM might prevent/resolve the aniseikonia (point 'd' above). So perhaps the ... This condition (retinally-induced aniseikonia) is probably attributable to residual damage from the pucker, although it could ... This condition (retinally-induced aniseikonia) is probably attributable to residual damage from the pucker, although it could ...
*  Critical titer test | definition of critical titer test by Medical dictionary
New Aniseikonia test A test for measuring aniseikonia. It consists of a booklet with pairs of half-moons, one green, the other ... The booklet is rotated to a horizontal position to measure the horizontal aniseikonia.. non-invasive break-up time test (NIBUT) ... If the sizes are actually equal the patient has no vertical aniseikonia; if the sizes are actually unequal the patient has ... aniseikonia in the vertical meridian. It consists of a 3 c+m-wide vertical septum placed in the centre of a mirror on which is ...
*  Words in 11 letters with K
aniseikonia An ophthalmological condition where there is a significant difference in the perceived size of images. ... Definition and anagrams of aniseikonia. → Other senses and detailed information on the Wiktionnary ...
*  Glossary | Cochrane Eyes and Vision
Aniseikonia. An optical condition in which the images that fall on the retina are of different sizes in the two eyes ...
*  Worth 4 dot test - Wikipedia
This is a common adaptation to strabismus, amblyopia and aniseikonia. The W4LT can be performed by the examiner at two ...
*  US5074875A - Intraocular-external lens combination system and method of using same - Google Patents
Article by Troutman Artiphakia and Aniseikonia , American Journal of Ophthalmology, pp. 602 639, Oct. 1963. * ... TROUTMAN, in an article entitled "Artiphakia and Aniseikonia", which appeared in the American Journal of Ophthalmology, pages ... Article by Troutman--"Artiphakia and Aniseikonia", --American Journal of Ophthalmology, pp. 602-639, Oct. 1963. ...
*  ICD-10 Charts
367.32H52.32Aniseikonia. *379.41H57.02Anisocoria. *367.31H52.31Anisometropia. *379.33H27.123Anterior dislocation of lens- ...
*  Adelbert Ames Jr. - Wikipedia
He conducted important research into aspects of binocular vision, including cyclophoria and aniseikonia. Ames is perhaps best ... and aniseikonia (in which each eye has a differently sized retinal image of the same object). This latter defect could be ...

(1/16) Saccade amplitude disconjugacy induced by aniseikonia: role of monocular depth cues.

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)

(2/16) Disconjugate oculomotor learning caused by feeble image-size inequality: differences between secondary and tertiary positions.

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)

(3/16) Differences in tests of aniseikonia.

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)

(4/16) Aniseikonia associated with epiretinal membranes.

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)

(5/16) Validity and repeatability of a new test for aniseikonia.

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)

(6/16) Effect of aniseikonia on fusion.

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)

(7/16) Magnifications of single and dual element accommodative intraocular lenses: paraxial optics analysis.


(8/16) The effect of lens-induced anisometropia on accommodation and vergence during human visual development.