Question

Blind spot in the retina contains ____________.

• A. only rod cells
• B. only cone cells
• C. both rod and cone cells
• D. neither rod nor cone cells

Hint:

Blind spot $=$ optic disc $=$ no photoreceptors (neither rods nor cones). That’s why you can’t “see” where the optic nerve leaves the eye.

Answer 1

The Correct Option is D

The blind spot (optic disc) is the point where the optic nerve exits the eye and blood vessels enter/leave.
Step 1: Structure at the optic disc $\Rightarrow$ there are no photoreceptors present.

Step 2: Consequence $\Rightarrow$ since rods and cones are absent, light falling here is not transduced, creating a physiological scotoma (blind spot).
Therefore options (A), (B), and (C) are incorrect, and \fbox{(D) neither rod nor cone cells} is correct.