Question

The cornea is a very important component of the eye. The main function of cornea is to
(A) Bend the light before it reaches the lens
(B) Provide the structural support to the eye
(C) Contain concentrated amount of cone cells in the correct orientation
(D) Change the shape of the lens to enable the image to be focused on the retina.

Answer 1

Hint: In the human eye, the cornea is the tissue of the transparent layers. It is formed with the continuous sclerotic tissues and is located above the pupil, iris and the lens of the eyes. It makes the front portion of the eyes and has the initial function for the focusing of the object by the retina.

Complete answer:
The cornea is made out of proteins and cells. The cornea is divided into five layers. They are the epithelium, Bowman's layer, the stroma, Descemet's film and the endothelium. The main layer, the epithelium, is a layer of cells covering the cornea. It ingests supplements and oxygen from tears and passes on it to the remainder of the cornea. It contains free sensitive spots.

These spots help in preventing the unfamiliar material to enter into the eyes. The cornea has the ability to fix itself rapidly from minor scraped areas. Nonetheless, more profound scraped areas may make scars structure on the cornea, which makes the cornea lose its transparency, prompting visual impedance. The main function of the cornea is to refract the light and bend it towards the lens. This makes the object fall on the retina.

Hence, the correct answer is Option (A).

Note: The cornea doesn't contain any blood vessels to discharge nutrients to the cornea. If they are present, they might cloud the cornea, which may keep it from refracting light appropriately and may unfavorably influence vision. Since there are no supplements providing veins in the cornea, tears and the fluid humor (a watery liquid) in the foremost chamber helps the cornea with supplements.