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The Merck Manual--Second Home Edition logo
 
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Chapter 230. Corneal Disorders
Topics: Introduction | Superficial Punctate Keratitis | Corneal Ulcer | Keratoconjunctivitis Sicca | Keratomalacia | Herpes Simplex Keratitis | Herpes Zoster Ophthalmicus | Peripheral Ulcerative Keratitis | Keratoconus | Bullous Keratopathy
 
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Introduction

The cornea is the domed covering in the front of the eye that protects the iris and lens and helps focus light on the retina. It is composed of cells, protein, and fluid. The cornea is normally as stiff as a fingernail, transparent, and very sensitive to touch. Corneal disease or damage can cause pain and loss of vision.

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