Question

1. what causes the blind spot?

Explanation:

The blind spot in the eye is caused by the absence of photoreceptor cells (rods and cones) at the location where the optic nerve exits the eye. This area, known as the optic disc, cannot detect light, resulting in a blind spot in the visual field.

Answer:

The blind spot is caused by the absence of photoreceptor cells at the optic disc where the optic nerve exits the eye.