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Why do I need my pupils dilated?

Dilating the pupils makes the pupils larger and non-reactive to light. This allows a clearer view of the inside of the eye, especially the periphery. This is similar to looking into a room through a small window (limited view) versus through an open door (unimpeded view). Many changes in the periphery of the eye, including small holes or tears and other changes cannot be seen without dilating the pupil. It is also standard of care in diabetics in order to better document any possible changes to the retina and blood vessels due to the diabetes.