Given the area of the retina
1. Macula 2. Fovea centralis 3. Optic disc 4. Periphery of the retina
Choose the arrangement that lists the areas according to the density of cones, starting with the area that has highest density of cones

Options

A. 2, 1, 4, 3
B. 2, 4, 1, 3
C. 1, 2, 3, 4
D. 1, 3, 2, 4

Answer

To answer the question regarding the arrangement of areas of the retina according to the density of cones, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Areas of the Retina**: The areas mentioned in the question are:
- Macula
- Fovea Centralis
- Optic Disc
- Periphery of the Retina

2. **Understand the Function of Cones**: Cones are photoreceptor cells in the retina that are responsible for color vision and function best in bright light. They are less sensitive to light compared to rods, which are responsible for vision in low light.

3. **Determine the Density of Cones in Each Area**:
- **Fovea Centralis**: This area has the highest density of cones, making it the most sensitive to fine detail and color.
- **Macula**: Surrounding the fovea, the macula also has a high density of cones, but less than that of the fovea.
- **Periphery of the Retina**: This area has a lower density of cones compared to the fovea and macula.
- **Optic Disc**: This area contains no photoreceptors (neither cones nor rods), making it a blind spot.

4. **Arrange the Areas According to Cone Density**: Based on the density of cones from highest to lowest, the correct order is:
1. Fovea Centralis (highest density)
2. Macula
3. Periphery of the Retina
4. Optic Disc (lowest density, none)

5. **Final Arrangement**: Therefore, the correct arrangement according to the density of cones is:
- Fovea Centralis (2)
- Macula (1)
- Periphery of the Retina (4)
- Optic Disc (3)

The final sequence is: **2, 1, 4, 3**.