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Effect of naturally occurring visual acuity differences between two eyes in stereoacuity
Author(s) -
Lam Andrew K. C.,
Chau Apries S. Y.,
Lam W. Y.,
Leung Gloria Y. O.,
Man Becky S. H.
Publication year - 1996
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.1996.95000348.x
Subject(s) - stereoscopic acuity , significant difference , visual acuity , ophthalmology , optometry , medicine , stereopsis , optics , physics
Summary Stereoacuity was measured in 30 subjects with a naturally occurring visual acuity (VA) difference between the eyes. The stereoacuity was measured by a modified Howard's apparatus using the staircase method and VA was measured with log MAR charts. Stereoacuity was worse in subjects with a large VA difference between the two eyes; the correlation between stereoacuity and VA difference was significant ( r = 0.76, P < 0.001). Neither the VA of the worse eye nor of the better eye contributed to the reduction in stereoacuity. The deterioration was more obvious if VA difference between the two eyes was one line or more (correlation coefficient, r = 0.88, P < 0.001). This study also reinforces the use of a 70% stereo‐threshold when attempt stereoacuity results to compare with other studies.