TY - JOUR
T1 - Anisometropia and binocularity
AU - Brooks, S. E.
AU - Johnson, D.
AU - Fischer, N.
N1 - Funding Information:
Originally received: August 14, 1995. Revision accepted: April 3, 1996. 1 Department of Ophthalmology, Medical College of Georgia, Augusta. 2 Department of Pediatrics, Medical College of Georgia, Augusta. Supported in part by an unrestricted departmental award from Research to Prevent Blindness, Inc, New York, New York. Presented in part as a poster at the American Academy of Ophthalmology Annual Meeting, Atlanta, October/November 1995. Each author states that he/she has no proprietary interest in any of the techniques or instruments mentioned in this report. Reprint requests to Steven E. Brooks, MD, Department of Ophthalmology, Medical College of Georgia, Augusta, GA 30912.
PY - 1996
Y1 - 1996
N2 - Purpose: To determine the effects of experimentally induced anisometropia on binocular function in healthy adults as a means of assessing the potentially detrimental effects of uncorrected anisometropia on binocular development in childhood. Methods: Nineteen adults with normal binocularity, ranging in age from 26 to 59 years, were studied. Unilateral myopia, hyperopia, or astigmatism (at 90° or 45°) was induced in each subject using trial lenses. Sensory status then was assessed by measuring stereoacuity, Worth four-dot fusion, and Bagolini lens response. Results: All subjects showed a decline in binocular function with increasing levels of anisometropia. Foveal suppression was evident on the Worth four-dot test, and increased in proportion to the anisometropia. Stereoacuity was similarly degraded by the induced anisometropia, with some subjects showing significant loss of stereoacuity with as little as 1 diopter of spherical anisometropia. Bagolini lens responses were binocular in almost all patients, although occasional abnormalities were found. Conclusions: Relatively low degrees of anisometropia may cause significant abnormalities in high-grade binocular visual functions in adults. The potential effects of uncorrected anisometropia on binocularity in children require further investigation, but should be considered in developing guidelines for the empiric correction of refractive errors.
AB - Purpose: To determine the effects of experimentally induced anisometropia on binocular function in healthy adults as a means of assessing the potentially detrimental effects of uncorrected anisometropia on binocular development in childhood. Methods: Nineteen adults with normal binocularity, ranging in age from 26 to 59 years, were studied. Unilateral myopia, hyperopia, or astigmatism (at 90° or 45°) was induced in each subject using trial lenses. Sensory status then was assessed by measuring stereoacuity, Worth four-dot fusion, and Bagolini lens response. Results: All subjects showed a decline in binocular function with increasing levels of anisometropia. Foveal suppression was evident on the Worth four-dot test, and increased in proportion to the anisometropia. Stereoacuity was similarly degraded by the induced anisometropia, with some subjects showing significant loss of stereoacuity with as little as 1 diopter of spherical anisometropia. Bagolini lens responses were binocular in almost all patients, although occasional abnormalities were found. Conclusions: Relatively low degrees of anisometropia may cause significant abnormalities in high-grade binocular visual functions in adults. The potential effects of uncorrected anisometropia on binocularity in children require further investigation, but should be considered in developing guidelines for the empiric correction of refractive errors.
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U2 - 10.1016/S0161-6420(96)30555-1
DO - 10.1016/S0161-6420(96)30555-1
M3 - Article
C2 - 8684806
AN - SCOPUS:0030014295
SN - 0161-6420
VL - 103
SP - 1139
EP - 1143
JO - Ophthalmology
JF - Ophthalmology
IS - 7
ER -