Hi, I Am Praveen And My Cousin Brother Was Suffering

Hi,
I am Praveen and my cousin brother was suffering from some eye disease. some doctors checked and says its rp (Retinitis pigmentosa) before some 3 or 5 year ago but in previous month again we visit an hospital in noida and they give report and says its tessellated fundus. Please help me to find out the treatment for this tessellated fundus he was likely totally blind at this time. is there any treatment available?