Mark the correct statement

Options

A. Blind spot contains only rods
B. Blind spot contains only cones
C. Blind spot contains both rods and cones
D. Fovea contains only cones

Answer

To solve the question regarding the correct statement about the blind spot and related structures of the eye, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Blind Spot**: The blind spot is an area located on the posterior pole of the eyeball where the optic nerve exits the eye. This area does not have any photoreceptor cells (rods or cones).

2. **Identify the Characteristics of the Blind Spot**: Since the blind spot lacks both rods and cones, any statement claiming that it contains only rods, only cones, or both rods and cones is incorrect.

3. **Learn about the Macula Lutea**: Just lateral to the blind spot is the macula lutea, which is a region of the retina responsible for high acuity vision.

4. **Focus on the Fovea Centralis**: The fovea centralis is the central part of the macula lutea and is known for containing only cones, which are responsible for color vision and high-resolution vision.

5. **Determine the Correct Statement**: Based on the information, the correct statement is that the fovea contains only cones and not rods. Therefore, any statement that suggests the blind spot contains rods or cones is incorrect.

6. **Select the Correct Option**: The correct answer is option number 4, which states that the fovea contains only cones.

### Final Answer:
The correct statement is: "The fovea contains only cones and not rods."

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