Is there anymore information to that question?
To monitor changes to the problem. They need to be able to see the changes.
Answer: Something you don't want to eat
Explanation: my bad jit
Answer:
Not enough information is given but my mom is in the medical feild and she says that a condition common with age is presbyopia. It causes the leanses in your eye to become less flexable and less able to thicken therefore less able to focus on near by objects. Another is catteracts which I assume you already know about so I will not explain.
Explanation:
It helps the person get closer and communicate with that person at face value. Working together strengthens the bond.