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This is a genetic disorder which is inherited and causes macular degeneration. It doesn't seem to have any association with diabetes.

Here is more info:

http://www.mdsupport.org/library/stargrdt.html

Those with Stargardt's disease are sensitive to glare; overcast days offer little relief. As the disease progresses, it can cause pain and diminishing sight. Vision is impaired first at the center, leaving peripheral vision intact. Symptoms usually appear before age 20. Symptoms include wavy vision, blind spots, blurriness, and difficulty adapting to dim lighting

Some patients are able to drive. Many patients use magnifiers to help them see, and wear sunglasses to slow the development.[2] Some doctors have recommended colored lenses which filter out the light wavelengths which stimulate rod vision

what color lenses are recommended for stargardts?