Question

The blind spot is the region where
A. Image is dim
B. Image is formed in strong light
C. Optic disc is present
D. Image is formed during the dark

Answer 1

Hint: In blind spots, no image could be seen. It is specifically that area from where the optic nerve exits the eye and goes straight to our brains. On the other hand, we can say that the portion of the retina where photoreceptors are absent is called blind spots.

Complete answer:
 The photoreceptors are the rods and cones. These rods and cones help us to see the objects during night and day respectively.These rods and cones are not present at the right of the center of vision of our two eyes. That is why, no such image would be formed at these positions and hence it is called the blind spot. The optic disk is called ‘Optic Nerve Head’. They present in the point of exits for the axons of a specific type of neuron cell which is called ‘Retinal Ganglion Cells’. In our eyes, near the inner surface of the retina, these ganglion cells are located. As there are no rods and cones found as overlying on Optic Nerve Head or on Optic Disk, the blind spot occurs in that region.

Note: All of us know that these receptors are responsible to respond to the light and create images that we could see. These blind spots are located in both eyes. In the right eye, it is to the right of the center of vision and for the left eye, it can be seen to the left of the center of vision.When we open our both eyes, we could not recognize the blind spots, because respective visual fields of both eyes overlap on each other.