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Can scattered light improve visual performance?

Purpose Light scattered by the media within the eye reduces object contrast and can also cause visual discomfort, in the presence of bright light sources. The addition of uniform veiling light over the retina can, however, change retinal sensitivity by increasing retinal illuminance. The extent to which reduction of target contrast and changes in retinal sensitivity caused by the presence of a glare source affect contrast acuity (CA) thresholds remains to be established. We investigate how CA is affected by glare source intensity, surround luminance and test target location on the retina. The aim is to determine the range of glare source intensity and background adaptation level that can improve visual performance.