The depression in the retina of eye which lodges only the cones is called

Options

A. blind spot
B. fovea centralis
C. fenestra rotunda
D. red nuclei

Explanation

To solve the question about the depression in the retina of the eye that lodges only the cones, we can follow these steps:

### Step 1: Understand the Structure of the Retina
The retina is a layer at the back of the eye that contains photoreceptor cells, which are responsible for converting light into neural signals. There are two main types of photoreceptors: rods and cones.

### Step 2: Identify the Function of Rods and Cones
- **Rods**: These are more sensitive to light and are responsible for vision in low-light conditions. They do not detect color.
- **Cones**: These are responsible for color vision and function best in bright light. They are concentrated in certain areas of the retina.

### Step 3: Locate the Fovea Centralis
The fovea centralis is a small depression in the retina where the concentration of cones is highest. It is responsible for sharp central vision, which is crucial for activities such as reading and writing.

### Step 4: Eliminate Other Options
- **Blind Spot**: This is the area where the optic nerve exits the eye and does not contain any photoreceptors (neither rods nor cones).
- **Fenestra Rotunda**: This is a part of the inner ear, not related to the retina.
- **Red Nuclei**: These are structures in the brainstem, unrelated to the eye.

### Step 5: Conclude the Answer
Since the fovea centralis is the only area in the retina that contains only cones, the correct answer to the question is **fovea centralis**.

### Final Answer
The depression in the retina of the eye which lodges only the cones is called **fovea centralis**.

---