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The sudden onset of flashing lights, a noticeable increase in the amount of floaters, a shadow in your peripheral vision, or a gray curtain moving across your field of vision could be signs of a detachment of the retina â the nerve layer in the back of the eye that sends images to the brain.
When fatty plaque deposits build up in blood vessels (due to, for example, diabetes, high blood pressure, smoking, or high cholesterol) and make them narrower, small pieces of plaque can break off from a blood vessel wall and block blood flow to the eye, causing temporary blindness. Other causes of temporary blindness include: Chemicals: Many chemicals can cause temporary blindness when sprayed in the eyes (i.e. pepper spray, mace, or even cleaning products). Conversion disorder: If you are experiencing severe psychological or emotional stress, you may experience a conversion disorder.