If it is true that...

Melatonin lowers body temperature, causes vasoconstriction in the brain, heart, and other organs, and slows reactions

and

Melatonin reduces behavioral sensitivity but increases the eyes' sensitivity to light, causing them to be injured by light that would otherwise be harmless

Then it must be true that...

Retinal injury is caused by ordinary light when the eyes are sensitized by melatonin, prolactin, and polyunsaturated fats