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12. Sudden vision changes
As we grow older, the quality of our eyesight will begin to worsen. This is a natural symptom of aging and should be dealt with by an optometrist. However, if you’re minding your own business and suddenly see flashes of brightly colored lights, inform your doctor right away. Brain and optic nerve tumors are known to cause sudden changes in vision. These conditions are not to be taken lightly. Seek professional help right away.