Cornea

CORNEA

The cornea is the clear, dome-shaped outermost layer covering the front of the eye. Often called the “windshield” of the eye, it has no blood vessels, relying instead on tears for nutrients. It is primarily responsible for about two-thirds of the eye’s total optical focusing power. 
Key Functions
  • Focusing Light: It bends (refracts) incoming light onto the crystalline lens, which directs it to the retina for clear vision.
  • Protection: It acts as a shield against dirt, dust, germs, and harmful ultraviolet (UV) rays. 

Anatomy

  • The cornea is remarkably thin (about 0.55 mm in the center) but consists of five distinct layers: 
    • Epithelium: The outermost layer that blocks debris and absorbs nutrients.
    • Bowman’s Layer: A tough, protective membrane.
    • Stroma: The thickest layer, made of water and precisely aligned collagen fibers to maintain transparency.
    • Descemet’s Membrane: A strong inner layer supporting the innermost cells.
    • Endothelium: A single cell layer that pumps fluid out of the cornea to keep it clear and prevent swelling.
    Common Conditions
    Because it is exposed, the cornea is susceptible to: 
    • Corneal Abrasions: Painful scratches on the surface, usually from trauma or foreign objects.
    • Keratoconus: A condition where the cornea thins and gradually bulges outward into a cone shape, causing distorted vision.
    • Corneal Ulcers: Serious, abscess-like infections that can lead to scarring and vision loss. 

Treatment and Care

Minor scratches typically heal with the aid of protective drops, but severe damage or diseases may require a partial or full cornea transplant. Surgical procedures like LASIK are also performed to reshape the cornea and correct refractive errors like nearsightedness or astigmatism.

FAQ

Persistent eye pain, redness, blurred vision, sensitivity to light, or a feeling of something stuck in the eye can all point to a corneal issue like an abrasion, infection, or early keratoconus. Since the cornea heals differently from other tissues in the body, these symptoms shouldn't be self-treated or ignored — a timely eye exam can prevent scarring or permanent vision loss.

Several eye hospitals in Kolkata, now perform cornea transplant surgery for patients with severe corneal damage, scarring, or disease that can't be managed with medication alone. A pre-surgery evaluation typically includes assessing the depth and location of corneal damage to determine whether a partial or full transplant is needed.

Yes, LASIK is widely available at eye hospitals across Kolkata for correcting refractive errors like nearsightedness and astigmatism by reshaping the cornea. Candidacy depends on corneal thickness and eye health, so a detailed corneal evaluation is usually done before confirming eligibility.

ASMII Eye Hospital in Birati, Kolkata brings together experienced specialists and modern diagnostic care for corneal conditions, so patients are evaluated and guided through treatment without being referred elsewhere. This continuity of care is why patients across Kolkata trust ASMII for their corneal health.