Keratitis Sicca (Dry Eye) – A Complete Patient Guide

What is Keratitis Sicca (Dry Eye)?

Keratitis sicca, more commonly called dry eye syndrome, is a multifactorial disease of the ocular surface that results from an insufficient quantity or poor quality of tears. Tears are essential for keeping the cornea (the clear front part of the eye) lubricated, providing nutrients, and protecting against infection. When the tear film is disrupted, the cornea becomes inflamed and irritated, leading to the symptoms and complications collectively known as keratitis sicca.

Dry eye can be temporary (e.g., after a long flight) or chronic (lasting months to years). It affects up to 30 % of adults over age 50 and is more common in women, especially after menopause.¹

Common Causes

Dry eye results from an imbalance between tear production and tear evaporation. The following conditions are the most frequent contributors:

• Age‑related decline in tear production – lacrimal gland function decreases with age.
• Hormonal changes – menopause, oral contraceptives, and hormone replacement therapy.
• Autoimmune diseases – Sjögren’s syndrome, rheumatoid arthritis, lupus, and thyroid eye disease.
• Meibomian gland dysfunction (MGD) – blockage or poor quality of the oily layer that prevents tear evaporation.
• Contact lens wear – especially extended‑wear lenses that reduce blink efficiency.
• Environmental factors – wind, low humidity, air‑conditioned or heated rooms, and smoke.
• Medications – antihistamines, decongestants, antidepressants, beta‑blockers, and isotretinoin.
• Refractive surgery – LASIK or PRK may temporarily affect corneal nerves that stimulate tear production.
• Blepharitis – inflammation of the eyelid margins that disrupts tear spread.
• Systemic diseases – diabetes, vitamin A deficiency, and graft‑versus‑host disease after bone‑marrow transplant.

Associated Symptoms

Patients with keratitis sicca often experience a combination of the following:

• Gritty, sand‑like sensation (foreign‑body feeling)
• Burning or stinging pain
• Redness of the conjunctiva
• Blurred vision that improves with blinking
• Excessive tearing (reflex tearing) after prolonged dryness
• Sensitivity to light (photophobia)
• Difficulty wearing contact lenses
• Eye fatigue, especially when reading or using screens

When to See a Doctor

Most cases of mild dryness can be managed at home, but you should schedule an eye‑care appointment if you notice:

• Symptoms persisting more than a few weeks despite over‑the‑counter lubricants.
• Frequent redness, swelling, or discharge.
• Fluctuating or worsening blurry vision.
• Eye pain that is sharp, severe, or does not improve with artificial tears.
• History of autoimmune disease, recent eye surgery, or new medication that could affect tear production.

Diagnosis

Eye specialists (ophthalmologists or optometrists) use a stepwise approach to confirm dry eye and identify its type (aqueous‑deficient vs. evaporative).

Clinical History

Discussion of symptom duration, medication list, systemic illnesses, and environmental exposures.

Physical Examination

• Slit‑lamp evaluation – assesses the cornea, conjunctiva, and eyelid margins.
• Tear Break‑Up Time (TBUT) – fluorescein dye is applied; the time until the first dry spot appears is measured. <10 seconds suggests instability.
• Schirmer Test – strips of filter paper placed under the lower eyelid for 5 minutes to quantify tear volume.
• Meibomian Gland Assessment – expression of the glands to evaluate oil quality.
• Ocular Surface Staining – with fluorescein, rose bengal, or lissamine green to highlight damaged epithelial cells.

Additional Tests (when needed)

• Osmolarity testing – high tear osmolarity (>308 mOsm/L) is a hallmark of dry eye.
• Inflammatory markers – matrix metalloproteinase‑9 (MMP‑9) point‑of‑care test.
• Imaging – meibography to visualize gland dropout.

Treatment Options

Therapy is individualized based on severity, underlying cause, and patient lifestyle. Goals are to restore a stable tear film, reduce inflammation, and protect the ocular surface.

1. Lifestyle & Home Measures

• Warm compresses (5–10 min, 2–3 × daily) followed by gentle lid massage to unblock meibomian glands.
• Humidifier use in dry indoor environments.
• Frequent blink exercises during screen work – 20‑second pause every 20 minutes.
• Protective eyewear (sunglasses) outdoors to reduce wind exposure.
• Stay hydrated; limit caffeine and alcohol that can dehydrate the ocular surface.

2. Over‑the‑Counter (OTC) Lubricants

• Artificial tears without preservatives (e.g., sodium hyaluronate, carboxymethylcellulose) – best for frequent use.
• Gel or ointment formulations for nighttime use.
• Lubricating eye drops containingRefresh® Optive, Systane® Ultra, or similar FDA‑cleared products.

3. Prescription Medications

• Ciclosporin A 0.05 % (Restasis®) – reduces ocular surface inflammation and increases tear production.
• Lifitegrast 5 % (Xiidra®) – an LFA‑1 antagonist that improves tear‑film stability.
• Short courses of topical corticosteroids (e.g., loteprednol) for acute inflammation, under close supervision.
• Oral tetracyclines (doxycycline 40 mg daily) or macrolides (azithromycin) to treat meibomian gland dysfunction.
• Autologous serum eye drops for severe cases refractory to conventional therapy.

4. Procedural Interventions

• Punctal plugs – silicone or collagen devices inserted into the tear drainage canals to retain tears.
• Thermal pulsation (e.g., LipiFlow®) – applies heat and gentle pressure to unblock meibomian glands.
• Intense pulsed light (IPL) therapy – reduces inflammation of the lids and improves gland function.
• Amniotic membrane or platelet‑rich plasma eye drops for severe ocular surface disease.

5. Managing Underlying Conditions

Effective control of systemic autoimmune disease, adjustment of offending medications, or treatment of blepharitis can markedly improve dry‑eye outcomes.

Prevention Tips

While some risk factors (age, genetics) cannot be changed, many everyday habits can reduce the likelihood of developing keratitis sicca or keep it from worsening:

• Take regular breaks using the 20‑20‑20 rule – every 20 minutes, look at something 20 feet away for 20 seconds.
• Keep screens clean and adjust brightness to minimize glare.
• Avoid direct airflow from hair dryers, air‑conditioners, or car vents toward the eyes.
• Limit contact lens wear time; follow proper cleaning protocols.
• Quit smoking; tobacco smoke aggravates tear evaporation.
• Schedule routine eye exams, especially if you have diabetes, thyroid disease, or an autoimmune condition.
• Discuss any new medications with your healthcare provider; ask about dry‑eye side effects.

Emergency Warning Signs

If you experience any of the following, seek immediate ophthalmologic or emergency care:

• Sudden, severe eye pain or a sharp stabbing sensation.
• Rapid loss of vision or persistent blurry vision that does not improve with blinking.
• Redness accompanied by thick, colored discharge (green, yellow, or pus‑like).
• Sensitivity to light with intense pain (possible corneal ulcer or infection).
• Noticeable swelling of the eyelid or surrounding facial area.
• History of recent eye trauma, surgery, or a foreign body that cannot be removed.