What is Ocular Surface Disease?

Ocular Surface Disease in India

Close your eyes. Open them. In the half-second that takes, a film of tears has just spread across the front of your eye, smoothing optical irregularities and delivering oxygen and antimicrobial protein to the surface. When the system works, you never think about it. When it stops working, it is the only thing you think about.

Ocular surface disease (OSD) is the umbrella term for conditions affecting the conjunctiva, cornea, tear film, and the glands that support them. The ocular surface is the front face of the eye: the transparent cornea, the conjunctiva lining the whites and inner eyelids, and the tear film that keeps the whole surface lubricated, nourished, and optically clear. When any of these components fails, the result is discomfort, blurred vision, and, in severe cases, permanent corneal scarring and vision loss.

The spectrum is wide. Dry eye disease is the commonest face of OSD, but the category also includes meibomian gland dysfunction, blepharitis, allergic and infective conjunctivitis, pterygium, pinguecula, chemical and thermal injuries, Stevens-Johnson syndrome, ocular cicatricial pemphigoid, and limbal stem cell deficiency. Treatment scales accordingly, from simple lubrication and lid hygiene at one end to advanced surgical reconstruction at the other.

Vasan Eye Care runs a dedicated ocular surface clinic led by cornea and external disease specialists, covering the full range of presentations with evidence-based medical and surgical care.

OSD is remarkably prevalent in India, and it is also remarkably undertreated. The combination of hot and dry climate across many regions, high levels of air pollution in cities, widespread and prolonged digital device use, and limited access to early eye care has produced a perfect storm. Dry eye disease alone is estimated to affect anywhere from 18 to 54 percent of Indians across various population studies, with digital eye strain and environmental exposure doing most of the damage.

Allergic conjunctivitis is endemic, and it is closely tied to keratoconus through the mechanism of eye rubbing. Chronic rubbing, provoked by itch, is one of the strongest modifiable risk factors for keratoconus progression. Treating the allergy is not just about comfort; it protects the cornea from mechanical damage.

Chemical injuries from lime (calcium hydroxide) used in construction, pan (betel) preparation, and agricultural settings represent a specific and severe ocular emergency in India. Alkali burns are more dangerous than acid burns because alkali penetrates deeper into the eye, and they need immediate, copious irrigation before any further examination. Pterygium, the fleshy encroachment of conjunctiva onto the cornea, is common in rural and outdoor-working populations exposed to UV and dust. Vasan Eye Care’s ocular surface service sees the full range.

Conditions Managed

How Does Diagnosis Work?

Diagnosis starts with a careful history. What do the symptoms feel like? Grittiness, burning, redness, watering, photophobia, or blurred vision that clears with a blink? How long? What medications does the patient use? Is there a systemic disease or an occupational or environmental exposure that matters? The story often tells you what category of OSD you are dealing with before a single test is done.

Slit-lamp examination of the eyelid margins, conjunctiva, cornea, and tear film is the cornerstone of the workup. Specific tests add objectivity:

• Tear break-up time (TBUT) to assess tear film stability
• Schirmer’s test to measure aqueous tear production
• Lissamine green and Rose Bengal staining to pick up devitalised surface cells
• Corneal fluorescein staining for epithelial defects
• Meibography to image the meibomian glands
• Conjunctival impression cytology for suspected limbal stem cell deficiency
• Esthesiometry (corneal sensitivity testing) for neurotrophic corneal disease

When Should You Seek Assessment?

• Persistent redness, grittiness, or burning that over-the-counter drops do not fix
• Blurred vision that fluctuates or briefly clears with blinking
• Excessive watering despite a feeling of dryness, which is the paradox of reflex tearing
• Photophobia (sensitivity to light) without another obvious cause
• A growing, fleshy lesion on the white of the eye creeping towards the cornea (pterygium)
• Any history of chemical splash, even if initially treated
• Severe allergic symptoms with intense itching and thick, stringy discharge
• Eye symptoms in anyone with a systemic autoimmune disease (lupus, rheumatoid arthritis, Sjögren’s syndrome)

Management: Step-by-Step

1. Assessment: slit-lamp examination, TBUT, Schirmer’s test, surface staining, meibography as indicated.
2. Classification: identify the primary mechanism (aqueous deficient dry eye, evaporative MGD-driven dry eye, or combined).
3. Lid hygiene: warm compresses and lid scrubs for MGD and blepharitis; demodex-specific treatment if lid infestation is confirmed.
4. Lubricating drops: preservative-free artificial tears for daytime, lubricating gel or ointment at night.
5. Anti-inflammatory therapy: topical cyclosporine or lifitegrast for moderate to severe dry eye; short-course topical steroids for VKC flares.
6. Punctal plugs: small silicone plugs placed in the lacrimal puncta to slow tear drainage and keep tears on the eye longer.
7. Advanced surface procedures: amniotic membrane transplantation for persistent epithelial defects; SLET or CLET for limbal stem cell deficiency; pterygium excision with conjunctival autograft.
8. Scleral contact lenses: for severe dry eye, SJS, or LSCD, where a fluid reservoir under a large rigid lens keeps a compromised surface hydrated.
9. Systemic management: in autoimmune-driven OSD, co-management with rheumatology for systemic immunosuppression.

Cost of OSD Treatment in India

Costs vary by severity and procedure. Vasan Eye Care works out a personalised plan after initial assessment.

Post-Treatment Care and Recovery

What to Expect After Treatment?

Response depends entirely on the underlying condition. Mild to moderate dry eye usually improves substantially with lubricating drops, lid hygiene, and fixing environmental triggers. More advanced disease may need months of anti-inflammatory therapy before the improvement feels real and sustained. After pterygium excision, expect two to three weeks of redness and mild discomfort; the conjunctival graft integrates over six to eight weeks.

For severe disease such as SJS or chemical injury with limbal stem cell deficiency, the timeline is measured in months, not weeks. The realistic goal is to stabilise the surface and maximise remaining vision, not to restore things to perfectly normal. Saying that honestly is part of looking after these patients well.

Post-Treatment Care Tips

• Use lubricating drops consistently. Preservative-free formulations are preferred for frequent dosing, because the preservatives themselves can harm the surface with heavy use.
• Keep up lid hygiene. Twice-daily warm compresses and gentle lid massage make a real difference in MGD.
• Reduce screen time where possible. When you cannot, blink consciously. Screen users blink about half as often as normal, which is a direct cause of evaporative dry eye.
• Avoid air conditioning directed at the face. Use a humidifier in dry rooms.
• Wear wraparound sunglasses outdoors. UV, wind, and dust are all ocular surface insults.
• Do not rub your eyes. Rubbing worsens surface inflammation and, over time, risks corneal deformation.
• Attend follow-up. OSD is often a long-term condition that needs adjusted therapy over months.

References

• • DEWS II Report. Tear Film and Ocular Surface Society, 2017.
  • American Academy of Ophthalmology. Dry Eye Syndrome.
  • PMC / NCBI. Ocular Surface Disease: A Review, 2020.