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Distance visual acuity and monovision

M Collins¹, A Goode, B Brown

¹Centre for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Australia.

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|September 1, 1993

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Monovision correction maintains binocular visual acuity similar to monocular acuity. However, residual astigmatism significantly reduces binocular acuity in monovision, suggesting correction is clinically important.

Area of Science:

Ophthalmology
Optometry
Vision Science

Background:

Monovision correction is a common method for presbyopia treatment.
Understanding factors affecting visual acuity in monovision is crucial for patient outcomes.

Purpose of the Study:

To investigate binocular visual acuity with monovision correction.
To assess the impact of residual astigmatism on monovision correction effectiveness.

Main Methods:

Evaluated binocular distance visual acuity using high and low contrast logMAR charts.
Assessed monovision correction with varying addition powers (+1.00 to +2.50 D).
Induced residual astigmatism (+0.50, +1.00, -1.00 D) to measure its effect.

Main Results:

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Binocular visual acuity in monovision approximated monocular acuity across tested defocus levels.
Neither the defocused eye nor pupil size affected high-contrast binocular acuity loss.
Residual astigmatism significantly reduced binocular acuity in monovision more than in normal binocular vision.

Conclusions:

Monovision correction is effective in maintaining visual acuity comparable to monocular performance.
Residual astigmatism significantly impairs binocular visual acuity in monovision, potentially due to meridional interocular suppression.
Clinical correction of low residual astigmatism is recommended for optimal monovision outcomes.