Which of the following is an incorrect statement about the human eye?

Options

A. Vitreous humor regulates the amount of light entering the pupil
B. Fovea is the center of the visual field and contains only cones
C. Ciliary muscle functions in accommodation
D. Retina lies just inside the choroid and contains the photoreceptor cells

Explanation

To determine which statement about the human eye is incorrect, let's analyze each option provided:

1. **Vitreous humor regulates the amount of light entering the pupil.**
- This statement is incorrect. The vitreous humor is a gel-like substance that fills the space between the lens and the retina. Its primary functions are to maintain the shape of the eye and to protect the retina by absorbing shocks. It does not regulate the amount of light entering the pupil; that function is performed by the iris and pupil.

2. **Fovea is the center that is rich in cones.**
- This statement is correct. The fovea is a small depression in the retina where visual acuity is highest, and it contains a high concentration of cone cells, which are responsible for color vision and sharpness of vision.

3. **Ciliary muscles function in accommodation.**
- This statement is also correct. The ciliary muscles are responsible for changing the shape of the lens to focus on objects at different distances, a process known as accommodation.

4. **Retina lies just inside the choroid layer.**
- This statement is correct as well. The retina is indeed the innermost layer of the eye, located just inside the choroid layer, which is the middle layer of the eye.

Based on the analysis above, the incorrect statement about the human eye is:
**Vitreous humor regulates the amount of light entering the pupil.**

### Step-by-Step Solution:
1. **Identify the statements about the human eye.**
2. **Evaluate the function of vitreous humor.**
- Understand that it does not regulate light but maintains eye shape and absorbs shocks.
3. **Assess the correctness of the other statements:**
- Confirm that the fovea is rich in cones.
- Verify that ciliary muscles are involved in accommodation.
- Check that the retina is located inside the choroid layer.
4. **Conclude which statement is incorrect.**