The cones are located in

Options

A. iris
B. sclerotic
C. choroid
D. retina

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of the Eye:**
- The human eye is composed of three main layers: the outer layer (sclera), the middle layer (choroid), and the inner layer (retina).

2. **Identifying the Layers:**
- The outer layer is called the sclera, which provides protection and structure to the eye.
- The middle layer is known as the choroid, which contains blood vessels and provides nourishment to the eye.
- The inner layer is the retina, which is crucial for vision.

3. **Photoreceptor Cells in the Retina:**
- The retina contains photoreceptor cells that are responsible for converting light into neural signals.
- There are two types of photoreceptor cells: rods and cones.

4. **Function of Cones:**
- Cones are responsible for color vision and function best in bright light conditions (daylight vision).

5. **Conclusion:**
- Therefore, the cones are located in the retina, which is the inner layer of the eye.

**Final Answer:**
The cones are located in the retina.

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