Dry eye disease occurs when tears aren't able to provide adequate moisture to the eyes, leading to changes in tear chemistry and compromised ocular surfaces. Common causes include aging, menopause, certain drugs, diseases that affect tear production, and eyelid or tear duct issues. Symptoms include burning, itching, aching, fatigue, dryness, redness, photosensitivity, and blurred vision. Treatment depends on the type and severity of dry eyes and may include warm compresses, intense pulse light, gland expression, lid hygiene, artificial tears, eye drops, or systemic medications.