Red eyes are a symptom, not a disease, caused by dilation of surface blood vessels due to irritation or inflammation. Key causes include:
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Dry Eyes
Reduced tear production or rapid evaporation causes burning, gritty sensation, and temporary blurry vision. Prevention: artificial tears, screen breaks, and humidified environments. -
Seasonal Allergies
Pollen, dust, or pet dander cause itching, tearing, and swollen eyelids. Treatment: avoid triggers and use antihistamine drops if needed. -
Conjunctivitis
Inflamed conjunctiva turns the eye red. Causes: viral, bacterial, or allergic. Treatment ranges from supportive care to antibiotics or anti-allergy medications. -
Blepharitis
Blocked oil glands at the eyelash base cause redness and crusting. Treatment: daily eyelid cleaning, warm compresses, and skin care management. -
Subconjunctival Hemorrhage
Bright red patch without pain from a broken tiny blood vessel, usually resolving within two weeks. -
Acute Glaucoma
Sudden high eye pressure with severe pain, nausea, headache, and halos around lights. Emergency treatment is critical to prevent permanent optic nerve damage. -
Contact Lenses
Overuse, sleeping in lenses, or improper cleaning may lead to irritation or infection. Solution: adhere to recommended wear time, disinfect lenses, and rest eyes. -
Eye Strain and Sleep Deprivation
Long hours or prolonged screen use dilate tiny blood vessels, increasing redness. The 20-20-20 rule helps give the eyes periodic rest. -
Environmental Irritants
Smoke, pool chlorine, pollution, and dry air can trigger redness. Rinse eyes with saline or use artificial tears. -
When Redness is Concerning
Severe pain, vision changes, light sensitivity, heavy discharge, or persistent redness for over a week requires urgent medical evaluation.
Preventive Measures
Avoid rubbing eyes, stay hydrated, take screen breaks, wash hands before touching eyes, and wear protective glasses in dusty environments.
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