Which of the following statement is not correct about choroid ?

Options

A. It is the most vascular structure
B. It is black in colour
C. It prevent internal reflection of light
D. It is the visual portion

Answer

To determine which statement is not correct about the choroid, we will analyze each of the provided options step by step.

### Step 1: Understand what the choroid is
The choroid is a layer of blood vessels and connective tissue located between the sclera (the outer layer of the eye) and the retina. Its primary function is to supply nutrients and oxygen to the outer layers of the retina.

### Step 2: Analyze each statement
1. **It is the most vascular structure**: This statement is correct. The choroid is indeed highly vascularized, containing a rich supply of blood vessels that nourish the retina.

2. **It is black in color**: This statement is also correct. The choroid contains melanin, which gives it a dark color that helps absorb excess light and prevent internal reflection.

3. **Prevents internal reflection of light**: This statement is correct as well. The dark pigmentation of the choroid helps to minimize light reflection within the eye, which is essential for clear vision.

4. **It is the visual portion**: This statement is incorrect. The choroid itself is not the visual portion of the eye; that role is primarily served by the retina. The choroid supports the retina but does not participate in the visual process directly.

### Conclusion
The statement that is not correct about the choroid is: **"It is the visual portion."**

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