A cone dystrophy is an
inherited ocular disorder characterized by the loss of
cone cells, the
photoreceptors responsible for both central and
color vision.The most common symptoms of cone dystrophy 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 and have progressive difficulty with daytime vision.
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.
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an inherited, progressive disease of the cone and rod cells in the retina which frequently leads to blindness. See
Cone-Rod Dystrophy in the MD Support Library.
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