Some people don't produce enough tears, or their bodies create tears that can't keep the eyes moist. When this happens, the eyes remain dry, and foreign materials are not washed away. Symptoms of dry eye include stinging sensations,redness, and eyelid twitching. There are many reasons a person may not be able to keep their eyes moist. As humans age, they produce fewer tears, especially post-menopausal women. Vitamin A deficiency, eye injuries, staring at a computer screen too long, some medications, smoking, exposure to wind or dry air, and certain medical conditions may all cause a lack of tears. Dry eyes may cause benign essential blepharospasm to worsen.

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