MUSCLE PHYSIOLOGY

Detailed explanation-1: -Cornea: The outer, transparent structure at the front of the eye that covers the iris, pupil and anterior chamber; it is the eye’s primary light-focusing structure.

Detailed explanation-2: -The iris is the colored part of the eye. A circular muscle in the iris controls the amount of light entering the eye through the pupil, the black area in the center of the iris. The cornea is the outer clear, round structure that covers the iris and the pupil.

Detailed explanation-3: -It protects the pupil, the iris, and the inside of the eye from penetration by foreign bodies and is the first and most powerful element in the eye’s focusing system. As light passes through the cornea, it is partially refracted before reaching the lens.

Detailed explanation-4: -The cornea is a transparent avascular tissue that acts as a structural barrier and protects the eye against infections. [1] Along with the tear film, it provides proper anterior refractive surface for the eye. Cornea contributes to two-third of the refractive power of the eye.

Detailed explanation-5: -The cornea is comprised of five layers: the epithelium, Bowman’s layer, the stroma, Descemet’s membrane, and the endothelium. The first layer, the epithelium, is a layer of cells covering the cornea. It absorbs nutrients and oxygen from tears and conveys it to the rest of the cornea.