How Does The Cornea Function?
Cornea is the clear transparent smooth yet durable layer of the eye. The cornea function is to act as a shield of the eye and to protect it from dusts, germs, harmful and any foreign particles. However, the protective task of cornea is shared with eye socket, eyelids, sclera and tears. The cornea function is to focus and control the entry of light into the eyes. The cornea account for a total of 65 to 75 percent of eye’s focusing power.
One among the common cornea function is to refract or bend the incoming light that strikes the cornea on to the lens. The cornea function is to act as a filter and screener to the most damaging ultraviolet wavelength rays in sunlight. Without the protection offered by cornea, the eyes may become susceptible to various injuries due to the harmful ultraviolet wavelength.
- Study of cornea function:
The cornea function can be studied with the help of a blue light and orange dye (fluorescein) called the fluorescien eye stain test. This test detects any damages caused to the cornea and also determines the presence of any foreign bodies or particles in the eye. The eyes surface is touched with a blotting paper containing the orange dye. After the application, the eyes are blinked to spread the dye coat from the tear fluid to the entire surface of cornea. This layer of tear film consists of oil, mucus and water to lubricate and protect the eye.
Then a blue light is focused on to the surface of the eye. If there are any damages or foreign particles on the cornea, they get stained in the presence of blue light and turn to green color. This test is most commonly performed to detect corneal abrasions or torn corneas. If there are no particles or of there is no damage caused to the cornea, the dye will remain in the tear film and would not stick to the eyes.