Question

The lens and cornea are not having a blood supply. So, the nutrients are supplied by-
A. Retina
B. Blindspot
C. Vitreous humour
D. Aqueous humour

Answer 1

It is the thin transparent fluid that is present between lens and cornea. It is 99.9% water and 0.1% other nutrients. It nourishes the cornea and lens. It is responsible for giving shape to the eyes.

Complete answer:
Let us try to understand each option, given above in brief. It will enable us to choose the most appropriate answer possible, by eliminating others.
The retina is the innermost layer of tissue of the human eye. It is actually an extension of the brain that has been formed embryonically from neural tissue. It is connected to the brain by the optic nerve. It is a multilayer tissue, one of which contains light-sensitive photoreceptor cells, rods, and cones. It helps in organizing visual information. After organizing, it sends the information to the brain through the optic nerve, as a result of which, we are able to see.
Aqueous humour is a water-like transparent fluid, very similar to plasma. It contains low concentrations of protein. The ciliary body, the structure that supports the lens secretes this fluid. It occupies both the posterior as well as anterior chambers of the eye. The major functions of this fluid include- providing nutrition to the eye, maintaining the eye in a pressurized state, preventing eyes from getting dry, plays an important role in the immune response to defend against pathogens.
Blindspot refers to the region in the retina that lacks receptors. As a result of which, we are unable to visualize the image that falls in this region. Vitreous humour is the colorless fluid, filled in the region between the lens and retina of the eye. It is composed of 99% of water and rests 1% consists of proteins, collagen, salts, and sugars.
So, the correct option is D.

Note: Do not confuse between aqueous humour and vitreous humour. Vitreous humour is located in the space between the retina and the lens, while aqueous humour is present between the lens and cornea. Another important difference between them is that the amount of vitreous humor is fixed in our eyes, and it does not move.