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:
Many patients have almost normal daytime vision but often report night vision problems. These night time difficulties are confirmed by our research and that of others.
Early AMD diagnosed by retinal photography, which reveals the presence of fatty deposits called drusen.
The early condition progresses to severe sight loss over 5-year period in around 60% of cases.
Patients may slow progression by improving their lifestyle.