As we age our ability to focus on near objects gets worse. By the time most people get into their forties they will need corrective lenses to help them read. Without these glasses letters in books will seem blurred. It is thought that this change is caused by the muscles controlling the lenses in our eyes gradually losing their elasticity. This process continues for up to twenty years then doesn’t get worse. It is not connected to any other eye condition, just a part of getting older and can be corrected with reading glasses.