Eye structure

Clear vision is something most people take for granted until it starts to slip. Words blur on a screen. Road signs look fuzzy. You find yourself holding a book at arm’s length just to read one sentence. That is usually when an eye exam enters the picture and a simple solution is suggested: single vision prescription lenses. But how do these lenses actually fix near or distance vision? Let’s break it down in plain English. Understanding Refractive Errors First, it helps to know why vision becomes blurry. The eye works like a camera. Light enters through the cornea, passes through the lens, and focuses on the retina at the back of the eye. When everything lines up, images look sharp. However, sometimes light does not focus exactly on the retina. Instead, it falls slightly in front of it or behind it. This is called a refractive error. There are two common types: Myopia or nearsightedness. You can see things up close, but distant objects look blurry. Hyperopia or farsightedness. You can...