Question

The point in the eye of mammals from which optic nerves and blood vessels leave the eyeball is called –
A. Yellow spot
B. Blindspot
C. Pars optica
D. Green spot

Answer 1

Hint: : No image formation takes place at this point due to absence of photoreceptors. The other name for this spot is optic nerve head.

Complete answer:

From the above diagram, we can visualize that yellow spot also known as the macula.
1. It is the functional center of an eye and also the place of sharpest sight.
2. The yellow color of the macula is due to its content of lutein and zeaxanthin.
3. Both of them are yellow xanthophyll carotenoids, which is derived from the diet.
4. Macula has the ability to absorb the excess of blue and ultraviolet radiation, entering the eye and thus acts as a natural sunblock in this part of the retina.
5. Blindspot is a small portion of the visual field of the eye. It corresponds to the position of the optic disk in the retina. It lacks photoreceptors, i.e., no rods and cones are present here. 6. So, no image detection is possible.
From this diagram, it is clearly visible that the blind spot is the point where blood vessels and the optic nerve are leaving the eyeball.

So, the correct option is B.

Note: There is a close relationship between eyes and the liver. Our ability to see depends mainly on the nourishment of our eyes, which comes from the blood that is stored in the liver. So, any disorder in the liver will be reflected in our vision.