In early AMD, the lipid deposits called drusen interfere with the process of recovering vision in the dark.
RapiDA is a new instrument designed to measure how quickly the eye improves sensitivity in dim lighting. When the lighting is low the rod photoreceptors, specialised for seeing in the dark, begin regenerating fresh photopigment. How quickly they can do this is a measure of retinal healthiness. The result is slowed sensitivity recovery.
RapiDA uses new techniques to measure recovery rate. It has the following features: