Which of the following gives an incorrect function for the structure?

Options

A. Lens focusing
B. Iris-regulation of amount of light
C. Choroid_location of cones
D. Sclera-protection

Explanation

To determine which of the following gives an incorrect function for the structures of the eye, we will analyze each option provided: lens, iris, choroid, and sclera.

### Step-by-Step Solution:

1. **Lens**:
- **Function**: The primary function of the lens is to focus light onto the retina. It can change its shape (contract or dilate) to adjust the focus for near or distant objects.
- **Conclusion**: The function attributed to the lens is correct.

2. **Iris**:
- **Function**: The iris regulates the amount of light that enters the eye by controlling the size of the pupil. It can contract in bright light and dilate in low light conditions.
- **Conclusion**: The function attributed to the iris is correct.

3. **Choroid**:
- **Function**: The choroid is a layer of tissue located between the sclera (the outer protective layer) and the retina (the inner layer where light is detected). Its primary function is to supply nutrients and oxygen to the eye through its blood vessels. It does not house the cone cells; those are located in the retina.
- **Conclusion**: The function attributed to the choroid as the location of the cones is incorrect.

4. **Sclera**:
- **Function**: The sclera is the white part of the eye and serves as a protective outer layer. It provides structure and protection to the inner components of the eye.
- **Conclusion**: The function attributed to the sclera is correct.

### Final Answer:
The incorrect function is attributed to the **choroid**, which is incorrectly described as the location of the cones.

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