You are right, after 40 years or around this period of life, we have to move the book a little further than usual so that we can see better. But we are not always ready to admit that our eyes have experienced a completely natural age-related changes called presbyopia.
Each of us has a lens inside the eye, to which muscle fibers are attached. Due to their work, the curvature of the lens changes, and the optics of our eye is easily rebuilt for vision at different distances. With age, the substance of the lens becomes denser and the strength of the muscle is no longer enough to change the curvature of the lens so that we can see clearly up close. Then you need reading glasses.
Sort: Trending