Visual acuity and monovision
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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|Item Type:||Conference Paper|
|Additional Information:||abstract published in Optometry and Vision Science, 69, pp.70-71|
|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 03:04|
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