Inability of the retina and iris to accommodate well to varying intensities of light. ... (05 Mar 2000) ... 
Type: Term Pronunciation: dis′ad-ap-tā′shŭn Definitions: 1. Inability of the retina and iris to accommodate well to varying intensities of light.
dysaptation, dysadaptation An impaired ability of the iris of the eye to accommodate to varying intensities of light.
faulty adaptation of the iris and retina to light.