Effect of naturally occurring visual acuity differences between two eyes in stereoacuity

Kwok Cheung Andrew Lam, Apries S.Y. Chau, W. Y. Lam, Gloria Y.O. Leung, Becky S.H. Man

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalOphthalmic and Physiological Optics
Issue number3
Publication statusPublished - 1 Jan 1996

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry
  • Sensory Systems


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