Bright light is harmful to the retina even if the retina isn't sensitized
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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 2Substances that sensitize the retina to light-damage can increase the incidence of new or metastatic cancers 1 0 1The retina responds to ordinary light 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 2Bright light contributes to retinal damage in babies 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 2Creating a "deficiency" of DHA prevents retinal damage from light 1 0 2