👉 Dioptres, in physics and optics, are a unit of magnification. In simple terms, it refers to how much light or other forms of electromagnetic radiation can be focused onto an object at a given distance from that object. A diopter is essentially a measure of the angle subtended by the beam of light when it passes through a certain distance from the eye on a person's head. For example, if you are looking at a 10-meter tall building, and your eyes