Describe the reason why humans have a blind spot in their vision.

Blind spot provides the site for the exit of optic nerve and entry of blood vessel in the eye.

Explanation:

Blind spot is present on the retina and contains a small portion of the visual field that correspond the optic disk. The optic disk is 0.06 inches in diameter.

The optic nerve fibers exits at the back of eye on the blind spot. The major blood vessels enter in the eyes through the blind spot that provides blood flow to the eyes. Rods and cone cells are absent in the blind spot, this provides a small gap in the visual field.

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