Why is vision lost when light hits the blind spot ?

Question

Anatomy and Physiology

Answer 1

Light is only interpreted when it excites photocells in the back of the eye located on the retina. These photocells are called "rods" and "cones".

The blind spot is a place on the eye where the optic nerve (the nerve which brings the visual information to the occipitial lobe of the brain) connects to the eye. Because of this nerve there are no rods OR cones here and thus no photocells to interpret the light hitting the eye in that area.

*******

Anya got the types of vision mixed up.

Scotopic vision is vision that is due to the activity of the rods of the retina only; it is the type of vision that occurs at very low levels of illumination, and it can detect differences of brightness but not of hue.

Photopic vision is vision in bright light, mediated by cone cells of the retina; daylight vision.

Answer 2

There are no rods/cons located at the blind spot. The blind spot is just the area in the back of the eye where the optic nerve leaves the eye to go to the brain.

Answer 3

at blind spot..the optic nerves leave the retina...blind spot is also called as the optic disc...and is devoid of rods and cones...thts y no vision is produced when light hits blind spot...cones and rods are responsible for vision...rods are responsible for photopic vision(black and white) and cones are color receptors responsible for scotopic vision......