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Complete blindness does not occur in Retinitis pigmentosa. This is one positive thing. Those affected first experience night blindness, followed by constriction of the visual field and eventually the loss of central vision late in the course of the disease.
Studies have suggested that treatment with antioxidants (such as vitamin A palmitate) may slow the disease from getting worse but they are debabtable.
Several clinical trials are in progress to investigate new treatments for retinitis pigmentosa. Microchip implants that go inside the retina are in the early stages of development for treating blindness associated with this condition. Thanks.
Pththisis bulbi is a term that describes atrophy and degeneration of a blind eye. It can be the end result of many conditions, almost any eye disease that results in blindness can produce phthisis bulbi. The condition often leads to an eye that is unsightly and/or painful. If there is no pain, then no treatment is required. This I am saying because you told me "His R eye has atrophied to blindness and he has not been able to see out of it for about ten years" which is suggesstive of that. Thanks.