Dry eyes occur when the eyes do not produce enough tears to remain comfortable. Common causes include insufficient tear production, hormonal changes, radiation treatment, diabetes, vitamin A deficiency, and autoimmune diseases. Symptoms include stinging, burning, pain, and redness. Treatment options include artificial tears, prescription drops like Restasis to reduce inflammation, steroid drops for short-term relief, inserts called punctal plugs, and nutritional supplements with omega-3 fatty acids.