Non polarized UV400 yellow lens skinny curved rectangle shape flip up that clips onto skinny curved rectangle shape prescription glasses. Flip-ups work best for glasses that closely resemble the shape of the flip-up. It also fits best if the frame is straight across the top so that when the flip-up clamps onto your glasses it is sitting straight across the top of your glasses. Measure your glasses width x height. It is best to add about 2mm's to the height of the flip up height to accommodate for how the flip up clamps onto your glasses. It is usually okay for the flip up lens to be a little wider or higher than your glasses, it will just overlap a little.
One Lens 56mm Width x 32mm Height
Total Width 125mm
One Lens 60mm Width x 35mm Height
Total Width 132mm
One Lens 62mm Width x 37mm Height
Total Width 140mm