''Correcting Focus Problems''

People have difficulties focussing clearly on objects some time in their lives. When children are growing in their teen years, the shape of their eye can change. This will affect their ability to focus on many different things and can also affect their learning too. They may need eyeglasses (concave lens)for a while. As adult age, their eyes'lenses flexibility will decrease, that makes it harder to focus on close objects. Adults may need eyeglasses too( convex lens ).