Treatment(ZT from Wikipedia)

There is currently no medical treatment that can completely cure retinitis pigmentosa, although the progression of the disease can be reduced by the daily intake of 15000 IU of vitamin A palmitate.[2] Recent studies have shown that proper vitamin A supplementation can postpone blindness by up to 10 years.[3] Scientists continue to investigate possible treatments. Future treatments may involve retinal transplants, artificial retinal implants,[4] gene therapy, stem cells, nutritional supplements, and/or drug therapies.

In a study published in the journal Nature, researchers working with mice at the University College London Institutes of Ophthalmology and Child Health and Moorfields Eye Hospital, transplanted mouse stem cells which were at an advanced stage of development, and already programmed to develop into photoreceptors, into mice that had been genetically induced to mimic the human conditions of retinitis pigmentosa and age-related macular degeneration. These photoreceptors developed and made the necessary neural connections to the animal's retinal nerve cells, a key step in the restoration of sight. Previously it was believed that the mature retina has no regenerative ability. This research may in the future lead to using transplants in humans to relieve blindness.