The nocturnal/stress hormones, especially prolactin and melatonin, do not make the retina more sensitive to light and more easily damaged
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Retinal injury is caused by ordinary light when the eyes are sensitized by melatonin, prolactin, and polyunsaturated fats 1 0 2Bright light isn't harmful to the retina if the retina isn't sensitized 1 0 2Melatonin and prolactin are induced by stress 1 0 2Melatonin, tryptophan, fish oils, St. John's wort, and omega -3 oils increase the risk of retinal light damage and macular degeneration 1 0 2Substances that sensitize the retina to light-damage can increase the incidence of new or metastatic cancers 1 0 1Almost any kind of stress increases the formation of melatonin 1 0 2Melatonin reduces behavioral sensitivity but increases the eyes' sensitivity to light, causing them to be injured by light that would otherwise be harmless 1 0 2The retina becomes easier to injure by light in old age for some of the same reasons that the infant's retina is susceptible 1 0 2Light and stress, especially with excess iron, damage the retina when the cells contain too much PUFA 1 0 2The nocturnal/stress hormones, especially prolactin and melatonin, make the retina more sensitive to light and more easily damaged 1 0 2