Please help! what is the visual disorder marked by the progressive degeneration of rods and cones?

Retinitis Pigmentosa: (RP) is a group of inherited diseases that cause retinal degeneration. Read about the most common types of RP, their patterns of inheritance & the genetic abnormalities that cause them on www.blindness.org/retinitis-pigmentosa#inherited. See an ophthalmologist if one of these runs in your family or if you are experiencing problems with your vision.