To solve the question regarding the receding of the near point and far point with age, we can break it down into the following steps:
### Step-by-Step Solution:
1. **Understanding Near Point and Far Point:**
- The near point is the closest distance at which the eye can focus on an object clearly, typically around 25 cm for a young, healthy eye.
- The far point is the farthest distance at which the eye can see an object clearly, which is generally considered to be at infinity.
2. **Changes with Age:**
- As people age, they often experience changes in their vision. The near point tends to move farther away, meaning they can no longer see objects that are very close clearly. Similarly, the far point can also change, leading to difficulties in seeing distant objects.
3. **Role of Ciliary Muscles:**
- The ability to focus on objects at different distances is facilitated by the ciliary muscles in the eye. These muscles adjust the shape of the lens, allowing it to change its focal length.
- When the ciliary muscles contract, the lens becomes thicker, allowing for better focus on nearby objects. Conversely, when they relax, the lens becomes thinner, which is better for distant objects.
4. **Weakening of Ciliary Muscles:**
- With age, the ciliary muscles can weaken, which affects their ability to contract and relax effectively. This weakening leads to a decreased ability to change the focal length of the lens, making it harder to focus on both near and far objects.
5. **Conclusion:**
- Therefore, the receding of the near point and far point with age is primarily due to the weakening of the ciliary muscles and the resulting decrease in the ability to change the focal length.
- Thus, both options A (Weakening of ciliary muscles) and B (Decreasing ability to change the focal length) are correct.
### Final Answer:
Both A and B are correct.
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