Diopter Correction page 2

Diopter correction is about getting a sharp image when you look through binoculars or a camera viewfinder. The diopter correction is often a small rotating wheel on the right side that lets you adjust focus. Because the image can be brought into focus, you can also look through the viewfinder or binoculars without your glasses. Got a different sharpness in one eye? On binoculars you can adjust that side separately with the diopter correction so you see everything perfectly sharp.