Complications and Risks of Dry Eye

Dry eye sounds like a small problem, and usually it is - but "usually" is doing real work in that sentence. Left ignored, especially in its moderate and severe forms, dry eye can damage the very surface you see through. Here is what is actually at stake.

Corneal damage. The tear film is the cornea's only protection. Chronic dryness breaks the surface down: first tiny dry spots (punctate erosions), then filamentary keratitis - painful strands of mucus and cells stuck to the cornea - and in severe, neglected cases, corneal thinning, ulcers and scarring. A corneal scar is permanent and sits right in the visual axis. This is the complication that justifies everything written elsewhere in this series.

Eye infections. Tears carry natural antimicrobial defences. With an unhealthy, dry surface, conjunctivitis and more serious corneal infections take hold more easily - one more reason nothing non-sterile should ever enter a dry eye.

Vision quality. Before any damage, there is daily frustration: fluctuating, smeary vision that blinks clear, glare and halos at night, and trouble with contact lenses. For people whose work is screens and documents, this alone is a quality-of-life and productivity issue worth treating.

The inflammation spiral. Untreated dry eye inflames the eye surface, and inflammation further suppresses the tear glands - a self-feeding cycle that moves patients from mild to moderate disease. Breaking the cycle early is far easier than reversing it late.

Rare but serious. In severe cases - especially with autoimmune disease like Sjogren's - corneal melt and perforation are possible. These are emergencies.

When to stop self-treating and see an ophthalmologist: real pain, persistent or worsening blur, marked light sensitivity, strongly one-sided symptoms, or no improvement after three to four weeks of sincere home care and lubricants.