Yeah, you are right. Many people more than 40 years old have to wear reading glasses when they want to do some reading. Because the kind of old man suffered the far sighted. According to the professional experts, when we want to see some staff in the distance, the tiny muscles will push and pull on our lens to change its shape, which will change its overall refractive power. Then, as the people are aging, the lens becomes stiffer, which will result in making it harder for the tinny muscle to change its shape. Consequently, the eyes can not have a full range of focus that will let the people see less clearly. At this time, the people have to rely on the reading glasses to do the focusing for us. Of course, if you find you have the mentioned above problem, you can ask the reading glasses to help you out. However, if you have been already with glasses for nearsighted, you can also wear the bifocals or progressive addition lenses. Good luck.