It only effects 1 out of every 33,000 million people. It causes little or no function of the cone cells or the retina.
Cones enable light adaptation, color perception, and fine detail perception.
If you are effected by this disease you are either partially or totally color blind, having poor visual activity, and enables your eyes to apadt normally to illumination that is brighter than twolight conditions. To deal with this disease people usually use tinted lenses, typically wearing very dark lenses outdoors.