Stargardt disease usually develops during childhood and adolescence. People with Stargardt disease first notice a problem with their central vision, which may be blurry, distorted or have dark areas. It may take longer than usual to adjust between bright environments to dark environments. Side vision is usually not affected, but color perception may be affected in the later stages of the disease.
The course of the disease varies from person to person. For some people the disease progresses slowly, then speeds up and levels off. Once a visual acuity of 20/40 is reached (meaning a person sees at 20 feet what a normal-seeing person sees at 40 feet), the disease often progresses rapidly, until it reaches 20/200, which is legal blindness.
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