Cornea Functions/ Blood Supply and Drainage

Question 1

Wavelengths that enter the cornea range between

Answer 1

290-2000 nm

Question 2

UVA, UVB, and UVC

Answer 2

UVC is completely absorbed by the ozone.

90% of UVB is absorbed by the ozone and the rest is absorbed by the cornea. UVB is damaging to cells and causes causes sunburns and is a risk factor for some types of cancers.

UVA is the least harmful. Partially absorbed by the cornea, majority absorbed by the lens. 3% still reaches the retina.

Question 3

Wavelengths of visible light, which allows for vision.

Answer 3

400-700nm. This is transmitted by the cornea. For optimal light transmission, cornea most be transparent.

Question 4

Transmission vs refraction

Answer 4

Transmission- Light travels through the cornea, undeviated.

Refraction- Light is deviated.

Question 5

How is nourishment for the cornea obtained

Answer 5

Nutrients such as glucose, amino acids, lipids, minerals, vitamins, and water are obtained by diffusion from the aqueous humor.

A smaller amount is obtained from limbal capillaries and the tear film.

Question 6

Oxygen for the cornea is primarily derived from ____ that is dissolved in the ___

Answer 6

atmospheric oxygen
Tear film

A smaller amount is obtained from the aqueous humor and limbal capillaries

Question 7

If the eye is closed, 2/3 of the oxygen that supplies the cornea is from ___

Answer 7

Palpebral capillaries. The remaining 1/3 is from the aqueous humor