Retina is most sensitive at

Answer

### Step-by-Step Text Solution

1. **Understanding the Retina**: The retina is a thin layer of tissue located at the back of the eye. It plays a crucial role in vision by converting light into neural signals that are sent to the brain.

2. **Components of the Retina**: The retina contains two main types of photoreceptor cells: rods and cones. Rods are responsible for vision in low light conditions, while cones are responsible for color vision and detailed sight.

3. **Key Areas of the Retina**:
- **Fovea Centralis**: This is a small, specialized area in the retina that is responsible for sharp central vision. It contains a high density of cones, making it the most sensitive part of the retina for detailed vision.
- **Optic Disc**: This is the point where the optic nerve exits the eye. It does not contain any photoreceptors, hence it is not sensitive to light (often referred to as the "blind spot").
- **Ora Serrata**: This is the serrated edge of the retina where it meets the ciliary body. It is not the most sensitive area for vision.

4. **Conclusion**: Among the options provided, the fovea centralis is the area of the retina that is most sensitive and is crucial for activities that require detailed vision, such as reading and driving.

5. **Final Answer**: The retina is most sensitive at the **fovea centralis**.