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Retinitis Pigmentosa is an eye disease leading to death of the rod photoreceptors and subsequent death of the the cones due to oxidative damage, resulting in blindeness. Several mutations have been found to cause Retinitis Pigmentosa; one of which is a mutation in the RHO gene of chromosome 3q22.[1]
It has recently been concluded that N-acetylcysteine might help prevents cone death in the retina.
Lee SY, Usui S, Zafar AB, Oveson BC, Jo YJ, Lu L, Masoudi S, Campochiaro PA., Nov 10, 2010,
N-acetylcysteine promotes long term survival of cones in a model of retinitis pigmentosa, found at: http://www.ncbi.nlm.nih.gov/pubmed/21069814