The cornea is the clear, dome-shaped surface that covers the front of the eye. It is the eye’s outermost lens — responsible for roughly two-thirds of the eye’s total focusing power — and its transparency and precise curvature are critical to sharp, undistorted vision. When the cornea is diseased, injured, or scarred, the consequences for vision can be severe. At Krishna Eye Care Centre, we provide specialist evaluation and management of a wide range of corneal conditions, bringing expert care to patients across Patna and Bihar.
Understanding the Cornea
The cornea has five distinct layers, each playing a specific role in maintaining clarity and function. Unlike most tissues in the body, the cornea contains no blood vessels — it receives its oxygen directly from the air and its nutrients from the fluid inside the eye. This avascular nature is what keeps it transparent, but it also makes it vulnerable to certain infections and slow to heal under some conditions.
Any disruption to the cornea’s surface, structure, or cellular health — whether from infection, injury, inflammation, or degeneration — can scatter or distort light entering the eye, resulting in blurred, hazy, or painful vision.
Conditions We Treat
Corneal Infections
Corneal infections (keratitis) can be caused by bacteria, viruses, fungi, or parasites. They are among the most vision-threatening eye emergencies and require prompt diagnosis and treatment.
- Bacterial Keratitis — often associated with contact lens misuse, eye injury, or compromised immune status; presents with rapid-onset redness, pain, discharge, and a white spot on the cornea
- Viral Keratitis (Herpes Simplex / Herpes Zoster) — caused by the herpes virus; can recur and cause progressive corneal scarring if not managed carefully
- Fungal Keratitis — more common after eye injuries involving vegetable matter or soil; can be severe and slow to respond to treatment
- Acanthamoeba Keratitis — a rare but serious infection associated with contact lens use in contaminated water; causes intense pain disproportionate to the apparent severity
Corneal Ulcers An open sore on the cornea surface, most commonly resulting from infection. Corneal ulcers can progress rapidly and leave permanent scars affecting vision. Early aggressive treatment is essential.
Dry Eye Disease A chronic condition in which the eye does not produce sufficient tears or the tears evaporate too quickly. Severe dry eye can damage the corneal surface, causing pain, visual fluctuation, and surface breakdown.
- Aqueous deficient dry eye — insufficient tear production
- Evaporative dry eye — rapid tear evaporation due to meibomian gland dysfunction
- Mixed dry eye — a combination of both
Corneal Dystrophies Inherited conditions causing progressive changes to the corneal layers, independent of environmental factors or injury.
- Fuchs’ Endothelial Dystrophy — progressive failure of the innermost corneal cell layer leading to corneal swelling, blurred vision, and glare
- Granular, Lattice, and Macular Dystrophies — deposits within the corneal stroma causing progressive opacification
- Keratoconus — a progressive condition in which the cornea thins and bulges forward into a cone shape, causing increasingly distorted and blurred vision; often begins in adolescence and progresses through early adulthood
Corneal Degenerations Age-related or environmentally influenced changes to the cornea, including:
- Pterygium — a fleshy growth of tissue extending from the white of the eye onto the cornea, associated with prolonged UV exposure; can cause irritation, redness, and vision distortion if it encroaches on the visual axis
- Pinguecula — a yellowish deposit on the conjunctiva adjacent to the cornea
- Arcus Senilis — a white or grey ring at the periphery of the cornea, common with age and sometimes associated with high cholesterol in younger patients
Corneal Scarring Scarring from previous infection, injury, chemical burns, or surgery can permanently affect corneal transparency. The extent to which it affects vision depends on its density, size, and proximity to the central visual axis.
Chemical and Thermal Injuries Eye injuries involving acids, alkalis, or heat require immediate and aggressive first aid followed by specialist management. Alkali burns are particularly dangerous as they penetrate deeply and rapidly. These are ocular emergencies.
Post-Surgical Corneal Complications Patients who have had previous eye surgery, including cataract surgery, refractive surgery, or corneal transplantation, may develop complications affecting the cornea that require ongoing specialist monitoring and management.
How Is Corneal Disease Diagnosed?
A thorough corneal evaluation uses several specialised techniques beyond standard eye examination.
Diagnostic assessments include:
- Slit Lamp Biomicroscopy — the primary tool for examining all layers of the cornea under high magnification with a specialised light beam
- Corneal Topography — mapping the curvature of the corneal surface; essential for diagnosing keratoconus and planning contact lens fitting or refractive surgery
- Corneal Tomography (Scheimpflug Imaging) — provides a three-dimensional map of the entire cornea including thickness distribution
- Specular Microscopy — examines the endothelial cell layer at the back of the cornea, critical for monitoring Fuchs’ dystrophy and assessing surgical risk
- Pachymetry — measurement of corneal thickness
- Confocal Microscopy — high-resolution imaging of corneal layers at a cellular level; particularly useful in diagnosing fungal or acanthamoeba keratitis
- Microbiological cultures and smears — for suspected infectious keratitis, samples are taken from the corneal lesion for laboratory identification of the organism
- Schirmer’s Test and Tear Film Assessment — to evaluate dry eye severity
Treatment Options
Medical Management Most corneal infections and inflammatory conditions are managed initially with topical medications — antibiotic, antiviral, antifungal, or anti-inflammatory eye drops, often in intensive regimens requiring drops every hour in acute infections.
- Antibiotic eye drops for bacterial keratitis
- Antiviral drops and oral agents for herpes keratitis
- Antifungal drops for fungal keratitis
- Lubricating drops, gels, and ointments for dry eye disease
- Anti-inflammatory drops for non-infectious keratitis and post-surgical inflammation
Collagen Cross-Linking (CXL) A minimally invasive procedure used to halt the progression of keratoconus. Riboflavin (vitamin B2) drops are applied to the cornea and activated with UV-A light, creating new bonds between collagen fibres that strengthen and stabilise the corneal structure. It does not reverse existing distortion but prevents further deterioration.
Rigid and Speciality Contact Lenses For patients with keratoconus or irregular corneal surfaces, standard spectacles often cannot provide adequate vision correction. Speciality contact lenses — including rigid gas-permeable lenses, scleral lenses, and hybrid lenses — vault over the irregular surface and provide significantly better visual acuity.
Pterygium Surgery When a pterygium threatens vision or causes persistent discomfort, surgical removal with conjunctival autograft (using the patient’s own tissue) provides effective treatment with low recurrence rates compared to older techniques.
Corneal Transplantation (Keratoplasty) When corneal scarring, dystrophy, or disease is severe enough to significantly impair vision and cannot be managed medically, corneal transplantation may be recommended.
- Penetrating Keratoplasty (PK) — full-thickness corneal transplant; the traditional approach, used when multiple layers are involved
- DSAEK (Descemet’s Stripping Automated Endothelial Keratoplasty) — selective replacement of just the back layer of the cornea; preferred for Fuchs’ dystrophy and endothelial failure
- DMEK (Descemet’s Membrane Endothelial Keratoplasty) — an even thinner, more precise version of endothelial transplant with faster visual recovery
- DALK (Deep Anterior Lamellar Keratoplasty) — replacement of the anterior corneal layers while preserving the patient’s own healthy endothelium; used for keratoconus and anterior stromal scarring
Amniotic Membrane Transplantation A biological dressing derived from placental tissue, used to promote healing in persistent corneal ulcers, chemical burns, or severe dry eye with surface breakdown.
Cornea Care and Contact Lens Safety
Contact lenses are a safe and effective form of vision correction when used correctly, but they are also the single biggest risk factor for serious corneal infections in the general population. Proper contact lens hygiene is essential.
Key safety principles:
- Never sleep in contact lenses unless specifically prescribed for overnight wear
- Never rinse lenses or lens cases with tap water
- Replace lens cases regularly and allow them to air dry
- Follow the replacement schedule for your lens type — never overwear monthly lenses
- Remove lenses immediately if your eye becomes red, painful, or uncomfortable
- Never wear lenses while swimming or in the shower
- Always wash and dry hands thoroughly before handling lenses
If you experience any sudden pain, redness, or vision change while wearing contact lenses, remove them immediately and seek urgent eye care.
Frequently Asked Questions
Q: What is keratoconus and can it be treated?
Keratoconus is a progressive condition where the cornea gradually thins and bulges into a cone shape, causing increasingly distorted vision. It typically begins in adolescence and may progress through the twenties and thirties before stabilising. Early-stage keratoconus can often be managed with speciality contact lenses. Collagen cross-linking can halt progression. Severe keratoconus may ultimately require corneal transplantation. Early diagnosis is key to preserving good vision.
Q: I have been told I have a corneal scar. Will my vision ever improve?
It depends on the size, density, and location of the scar. Scars outside the central visual axis may have minimal impact on vision. Dense central scars that significantly impair vision may benefit from corneal transplantation. Dr Meha Kantha can assess the scar and advise whether intervention is likely to improve your vision.
Q: Is a corneal transplant a major surgery?
Corneal transplantation is performed under local or general anaesthesia as a day procedure or with a short hospital stay. Modern techniques such as DSAEK and DMEK are far less invasive than traditional full-thickness transplants, with faster recovery times and better outcomes. The eye will require careful monitoring and anti-rejection drops for an extended period after surgery.
Q: Can corneal transplants be rejected?
Yes, corneal graft rejection is possible and can occur months or even years after surgery. However, the cornea is an immune-privileged site — it has a lower rejection rate than many other transplanted organs. Warning signs of rejection include sudden redness, pain, sensitivity to light, and deteriorating vision. These require urgent medical attention. Long-term use of anti-rejection eye drops significantly reduces the risk.
Q: My eyes are always dry and gritty. Is this serious?
Dry eye disease is very common and ranges from mild to severe. While mild dry eye causes discomfort and visual fluctuation, severe or untreated dry eye can damage the corneal surface and lead to more serious problems. A proper assessment will determine the type and severity of your dry eye and guide the most appropriate treatment — which may range from lubricating drops to more targeted therapies for meibomian gland dysfunction.
Q: I got something in my eye and now it feels scratched. What should I do?
A scratched cornea (corneal abrasion) is painful but usually heals within 24 to 48 hours with appropriate treatment. However, if the eye remains painful, red, or develops a white spot, this could indicate an infection and requires urgent evaluation. Do not rub your eye and seek prompt medical attention, particularly if the injury involved a plant, soil, or contaminated material.
Q: Is cornea care available in Patna?
Yes. Comprehensive corneal evaluation and management are available at Krishna Eye Care Centre, Dr K K Kantha Memorial Hospital, Patna.
Book a Consultation
Corneal conditions can progress silently or rapidly — early evaluation is always the right decision. Whether you are experiencing eye pain, blurred vision, redness, or have been told you have a corneal condition, specialist care is available close to home.
📞 +91 893 583 4142 | +91 886 400 4584
📍 21 B/3, Patliputra Colony, Near Pataliputra Golambar, Opp. UNICEF Building, Patna 800 013
🌐 Book online at kanthahospital.com