Neuronal ceroid-lipofuscinoses (NLC) are a clinically and genetically heterogeneous group of lysosomal storage diseases. The most common NCL is the juvenile type which begins between the ages of 4 and 10 years in most cases with sudden visual loss which correlates with maculopathy and leads to blindness within a few years of presentation. After several years neurological deterioration ensues and in most cases death occurs in the 3rd decade of life. As with other storage disorders NCL is an incurable disease.