The effect of continuous bright light on the retina of albino rats was studied. It was found that after several hours of exposure the electroretinogram (ERG) deteriorated. However, this phenomenon was found to be reversible. Evidence is presented to show that the deterioration and recovery of the ERG is related to tissue damage and regeneration. Support is given to the theory that the mediating factor in the light damage is chronic visual pigment bleaching.
GORN RA, KUWABARA T. Retinal Damage by Visible LightA Physiologic Study. Arch Ophthalmol. 1967;77(1):115-118. doi:10.1001/archopht.1967.00980020117025