It is the red cheery spots on the retina that causes vision problem,
Myoclonus Cherry Red Spot 200 250 650 2500 3000 7500 (sq 9650 3261-6 5342-5 6524-3) Hz
and a short list of diseases that may brought about this problem,
Sialidosis 200 250 650 2500 3000 7500 (sq 9650 3261-6 5342-5 6524-3) Hz
Tay-Sachs Disease 120 200 (sq 2750 4750 9650 5342-5 6912-7 7530-7 9271) Hz
Niemann-Pick Diseases 50 460 950 7500 (sq 3250 1543-1 2675 3525-7 4111-2 6342-5) Hz
Shy-Drager Syndrome 70 8000 (sq 1398 4250 9750 3251-7 5157 6500 7500 9271) Hz
Turner Syndrome, Male 40 180 780 2500 7500 (sq 5529 8750 9552 2252-9 5193-4) Hz
and
Turner Syndrome 70 570 730 2500 (sq 5000 1500 4750 5270 6637-1 7765) Hz
UV burns can cause genetic disorders and the 'red spots' are blisters due to the burns.
Maybe.