Well, yes, you can just suggest your grandmother to have some eye exercises to treat her presbyopia. And generally speaking, as people age, the lenses of their eyes lose flexibility. At this time, it will just make close-up objects appear blurry, and this is named as presbyopia. Of course, people can try some ways to treat it. And exercises can be a good way. For example, you can just cross your eyes and focus on the tip of your nose, and then look at a far-off object and focusing on it. You should remember that it should be repeated in time with your breathing, looking at your nose as you inhale and the far-off object as you exhale. So your grandma may have a try.