Eighty-eight percent of those responding to a Vision Council of America survey indicated that comfort was the most important factor when choosing eyeglass frames. Eyeglasses should fit securely on the bridge of the nose, without causing those painful red marks. In fact, they should not press against the face at any point and should stay in place when the wearer moves his or her head or even bends over to touch his or her toes. Glasses that fit properly also ensure accurate vision correction. With this in mind, a proper fitting involves careful measurement of the wearer’s features and a match with standard eyeglass frame sizes as represented by three fitting numbers on the side of the frame. Eyeglass frames must fit properly on the bridge of your nose and stay in place whether you are looking up, down, or sideways. The three fitting numbers stamped onto the inside of the eyeglass frames represent eye size, bridge size, and temple length, respectively (in millimeters).