Its studies are still in progress and the target group is the patient group who has not completely lost their sight and has living cells in sleep mode. The rationale of stem cell therapy is to inject cells capable of secreting growth factor between 6 months and 3 years, into or around the eye, and repeat this process every 6 months or 3 years. In gene therapy, the faulty gene in photoreceptors that have not lost their vitality is detected, the corrected gene is loaded into viruses and injected into the eye. The aim is again to stop the death of living photoreceptors.