Question

5. Define the terms:
(a) Blind spot on the retina
(b) Persistence of vision of human eye​

Answer 1

Answer:

(a) Blind spot on the retina is where the optic nerve connecting the eye to the brain is located. There are no cells present over which can detect light. This is the reason why it is called the "blind spot".

Answer 2

Answer:

(a) Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.

(b) Persistence of vision is the optical phenomenon where the illusion of motion is created because the brain interprets multiple still images as one. ... The human eye and brain can only process about 12 separate images per second, retaining an image for 1/16 of a second.