Related Experiment Videos
Night vision testing in unoperated eyes
G J Florakis1, D A Jewelewicz, N I Fan
1Edward S. Harkness Eye Institute, Columbia University, New York, NY, USA.
Background:
We previously described a simple test which evaluates image degradation in post-excimer laser (PRK) patients under scotopic conditions. After refractive surgery, corneal haze, ablation zone decentration, ablation zone/pupillary diameter disparity, and under-correction each result in a characteristic pattern on the Night Vision Recording Chart.
Methods:
Using the same method, further studies evaluated night vision image degradation in 118 un-operated emmetropic, myopic, hyperopic, and astigmatic eyes and in 26 contact lens wearers.
Results:
Scotopic image degradation increases with myopic refractive error, image displacement increases with astigmatism, and contact lens wearers have more image degradation that with spectacle correction.
Conclusion:
Our Night Vision Recording Chart offers a simple, reproducible method to characterize image degradation under scotopic conditions.