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Evaluation of night vision disturbances
G J Florakis1, D A Jewelewicz, H E Michelsen
1Department of Ophthalmology, Columbia Presbyterian Medical Center, New York, NY 10032.
Journal of Refractive and Corneal Surgery
|May 1, 1994
Summary
A new objective test quantifies night vision disturbances. This method measures glare and decentration, proving more reliable than subjective responses for evaluating visual disturbances.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Traditional night vision disturbance evaluation relies on subjective patient reports.
- Objective measurement methods for night vision disturbances are needed.
Purpose of the Study:
- To introduce and validate a novel, objective test for quantifying night vision disturbances.
- To assess the test's utility under various lighting and refractive conditions.
Main Methods:
- A new test involves projecting a circle onto a visual acuity screen.
- Patients draw perceived images on an Amsler grid under photopic and scotopic conditions.
- 118 eyes were evaluated with different refractive corrections.
Main Results:
- Image degradation significantly increased in scotopic conditions for myopes, hyperopes, and emmetropes.
- Myopic refractive error correlated with glare response size (p = .001).
- Astigmatism correlated with glare response decentration (p = .0001), which was higher in scotopic conditions.
Conclusions:
- The developed test provides a simple, objective method for evaluating night vision disturbances.
- This objective test may aid in assessing patients considering refractive surgery.