Sunday, January 19, 2014
Cornea is a clear transparent and elliptical structure with a smooth shinig surface. the average diameter is 11-12 mm The thickness of the central part is 0.52 mm and the peripheral part is 0.67 mm. The central one third is known as the optical zone. The refractive index of cornea is 1.37. The diopteric power of cornea is approximately 43 to 45 dioptres. The cornea consists of fie layers namely 1. The epithelium 2. Bowman’s membrane 3. The stroma 4. Descemets membrane 5. Endothelium There are two primary functions of cornea. 1. It acts as a major refractory medium 2. It protects the intraocular contents.