Hi. My sons, 2 1/2 (severely visually impaired) and 11 months (only has reduced vision) both had ERG's and everything is pointing to Retinitis Pigmentosa without pigmentation (sine pigmento). Is this also progressive as with normal RP? How long will it take for my younger son to be severly affected? My husband and I have no known history of RP in our families.
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