Presbyopia occurs when your eyes gradually lose the ability to focus clearly on objects that are close to you, usually in those over the age of 40. Even if you have never had vision problems, you can still develop presbyopia. That’s because it is a normal part of the aging process. It happens when the lens gradually thickens and loses its flexibility. Just like the rest of your body, as you get older the eyes naturally undergo several changes, and it can become difficult to see things clearly up close or read without eye strain. Age-related farsightedness (presbyopia) at some point, affects everyone. Unfortunately, it is an inevitable part of aging. It cannot be prevented, but it is treatable.