The most common symptoms of<unk>  are vision loss (age of onset ranging from the late teens to the sixties), sensitivity to bright lights, and poor color vision. Therefore, patients see better at dusk. Visual acuity usually deteriorates gradually, but it can deteriorate rapidly to 20/200; later, in more severe cases, it drops to "counting fingers" vision. Color vision testing using color test plates (HRR series) reveals many errors on both red-green and blue-yellow plates.<unk>  of the rods and<unk> s ==<unk>  of the light-sensing cells of the eye may also occur in the rods as well, or in both the<unk> s and the rods. A type of rod-cone<unk> —where rod function decline is typically earlier or more pronounced than<unk> —has been identified as a relatively common characteristic of Bardet–Biedl Syndrome. At least one type of autosomal dominant<unk> -rod<unk>  is caused by mutations in the guanylate cyclase 2D gene (GUCY2D) on chromosome 17.
Cone dystrophy
Muscular dystrophy
Giant axonal neuropathy
Cuban neuropathy
Polyneuropathy
Chondrodystrophy
Brody myopathy
Tropical ataxic neuropathy