Diopter refers to the curvature of the lens. As the diopter increases, the lens become thicker and the curvature greater. As the curvature increases, light rays are redirected to fill a greater portion of the viewer’s retina which makes the object look bigger.
Powers refers to how much larger an object is made to look through a magnifying lens. Power is typically indicated by an X such 2X or 4X.
There is more than one formula to converts the diopter of a lens into its power, we as a company use the common formula: Magnification = (Diopter / 4) +1
For example an 3 diopter lens makes an object look 75% times larger, over and above what the unaided eye already sees.