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Visual acuity and monovision

Collins, Michael J., Goode, Andrew, & Brown, Brian (1992) Visual acuity and monovision. In American Academy of Optometry Meeting, 1992, Orlando, Florida.

Abstract

We have investigated aspects of visual acuity with monovision correction. Visual acuities were measured using high contrast Bailey-Lovie charts at 6m under photopic conditions. Binocular visual acuity with monovision was approximately equal to monocular visual acuity for addition powers (monocular defocus) of +l.OOD to +2.50D. Monocular and monovision visual acuities were about 3 letters worse than binocular visual acuity. Neither the eye chosen to be defocused (dominant or nondominant) or pupil size (3.5, 5 and 7mm), affected the binocular acuity loss with monovision. We also investigated the effect of induced residual astigmatism (+0.50DC and +l.OODC) on binocular visual acuity with monovision correction. Residual astigmatism caused a significantly greater loss of binocular visual acuity in the monovision condition than it did in the normal binocular condition. With +0.50DC of induced residual astigmatism, the loss of acuity in the monovision condition was about one line greater than in the normal binocular condition (t-test, p=0.002). With +l.OODC of induced residual astigmatism, the loss of visual acuity under the monovision condition was about 3 lines greater than in the normal binocular condition (t-test, p=0.0001). It is therefore of clinical importance to correct low amounts of residual astigmatism in monovision corrections to provide optimum binocular visual acuity. This effect appears to be related to a process of binocular meridional interocular suppression, where a blurred meridian in one eye can be compensated for by the fellow eye, if that same meridian is clear in the fellow eye.

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ID Code: 12217
Item Type: Conference Paper
Additional Information: abstract published in Optometry and Vision Science, 69, pp.70-71
Additional URLs:
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Divisions: Current > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1992 Lippincott Williams & Wilkins
Deposited On: 25 Jan 2008
Last Modified: 10 Nov 2014 13:04

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