Retina is most sensitive at

Options

A. macula lutea
B. optic disc
C. fovea centrailis
D. periphery

Explanation

**Step-by-Step Solution:**

1. **Understanding the Retina**: The retina is a crucial part of the eye where images are formed. It contains photoreceptor cells that respond to light.

2. **Identifying Key Areas of the Retina**: The retina has different areas, each with varying sensitivity to light. The two main types of photoreceptors are rods and cones. Rods are more sensitive to low light levels, while cones are responsible for color vision and function best in bright light.

3. **Fovea Centralis**: The fovea centralis is a small pit located in the macula lutea of the retina. It is densely packed with cones and is responsible for sharp central vision. This area is where visual acuity is highest.

4. **Comparing Other Areas**: Other areas of the retina, such as the optic disc (where the optic nerve exits the eye) and the periphery, do not have the same concentration of cones, making them less sensitive for detailed vision.

5. **Conclusion**: Given that the fovea centralis has the highest concentration of cones, it is the most sensitive area of the retina for visual acuity.

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

---