This patient-education article is written by the cornea service at Suraj Eye Institute, Nagpur.

What is Dry Eye Disease?

Dry eye disease is a chronic disorder of the tear film and the ocular surface in which the eye does not have an adequate, stable layer of tears to lubricate, protect and refract light through the cornea. It causes daily symptoms of grittiness, burning and fluctuating vision, and in severe cases damages the ocular surface itself.

Modern classification (the international DEWS-II framework) recognises two principal mechanisms, which usually co-exist:

  • Evaporative dry eye — the lipid layer of the tear film is deficient (usually because of meibomian gland dysfunction), so tears evaporate too quickly. This is the commonest form.
  • Aqueous-deficient dry eye — the lacrimal gland does not produce enough watery tears. Sjögren disease, age and certain medications are common causes.
Tear Film — Normal vs Dry Eye

The Three-Layer Tear Film: Normal vs Dry Eye

NORMAL TEAR FILM

Corneal epithelium

Mucin

Aqueous

Lipid

✓ Stable, smooth, even tear film

DRY EYE TEAR FILM

Corneal epithelium (stained spots)

Mucin (patchy)

Aqueous (thin)

Lipid (deficient)

Rapid tear break-up ✗ Unstable, evaporates quickly, surface staining

Figure 1. The tear film has three layers: an outer lipid layer (produced by the meibomian glands) that prevents evaporation, a thick middle aqueous layer (from the lacrimal gland) that lubricates and supplies nutrients, and an inner mucin layer that anchors the tear film to the corneal epithelium. In dry eye, any of these layers can be deficient. The most common pattern is a thin, patchy lipid layer (from meibomian gland dysfunction), causing rapid evaporation, an unstable surface and small staining spots on the cornea.

Symptoms

Typical symptoms include grittiness or a foreign body sensation, burning, transient blurring of vision that improves with blinking, redness, and paradoxical watering (reflex tearing). Reading, screen use, air-conditioning and outdoor wind characteristically worsen symptoms.

How Dry Eye is Diagnosed

Diagnosis is based on history, a structured symptom questionnaire and clinical signs:

  • Tear break-up time (TBUT) — a fluorescein dye test measuring how quickly the tear film destabilises after a blink
  • Schirmer test — measures tear production
  • Ocular surface staining with fluorescein and lissamine green to detect epithelial damage
  • Meibography — an infrared image of the meibomian glands to detect drop-out

Treatment

Treatment is tiered. Most patients respond to the first one or two steps:

  • Step 1 — preservative-free lubricants, omega-3 supplements, lid hygiene and warm compresses, environmental modification (screen breaks, humidifier, hydration)
  • Step 2 — punctal plugs to retain tears, topical cyclosporine 0.05 % or lifitegrast for the inflammatory component
  • Step 3 — targeted treatment of meibomian gland dysfunction (warm-compress devices, topical azithromycin, intense pulsed light therapy), autologous serum drops, therapeutic bandage contact lenses
  • Step 4 — surgical options (permanent punctal occlusion, salivary gland transposition) in severe Sjögren-type disease
Dry eye is a chronic disease. The aim is long-term control of symptoms and prevention of ocular surface damage rather than a single cure. Lid hygiene, blink awareness during screen use and ongoing lubrication are lifelong habits for most patients.
✔ Dry Eye Care at Suraj Eye Institute

Our cornea service offers structured DEWS-II based dry eye assessment, meibography for lipid-layer evaluation, in-clinic Schirmer test and ocular surface staining, and a tiered treatment ladder — from preservative-free lubricants and lid hygiene to punctal occlusion, topical cyclosporine and modern lipid-layer therapies for meibomian gland dysfunction.

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Frequently Asked Questions

My eyes water all day — how can I have dry eye?
Watering is one of the commonest signs of dry eye. When the ocular surface is irritated by an unstable tear film, the lacrimal gland produces a flood of reflex tears that pour over the lid because the lid drainage system cannot keep up. Treating the underlying dry eye almost always reduces the watering.

Will lubricant drops cure dry eye?
Lubricants relieve symptoms and protect the surface, but they do not treat the underlying cause. Most patients also need lid hygiene and treatment of meibomian gland dysfunction, and a minority need anti-inflammatory drops. Lifelong control rather than cure is the realistic aim for chronic disease.

Why do my symptoms get worse on a screen or in air-conditioning?
We blink up to 70 % less when looking at a screen, and air-conditioning increases evaporation. Both destabilise the tear film. Conscious blinking, short screen breaks every 20 minutes and a desktop humidifier help most office workers.

Is dry eye related to my arthritis (or thyroid disease)?
Yes — dry eye is associated with several systemic conditions including rheumatoid arthritis, Sjögren syndrome, thyroid disease and rosacea. We will ask about general health and may suggest investigations or rheumatology referral where appropriate.

Are over-the-counter drops safe to use long term?
Preservative-free lubricants are safe for long-term use. Drops containing preservatives such as benzalkonium chloride should be limited to four times a day; with chronic use they damage the ocular surface. We routinely recommend preservative-free preparations.

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