The Carson Clip & Flip Clip-on, Flip-up Magnifying Lenses for Eyeglasses are flip-up magnifying lenses that turn any pair of regular glasses into flip-down hands-free magnifiers. These Clip&Flip Magnifying Lenses by Carson are great for special projects that require both hands to be free. Carson Clip N Flip Magnifying Lenses are offered in magnifications of 1.5x, 1.75x, or 2x for a choice of magnification that fits a specific application. Each magnification is rated with a positive diopter value, from +2.25 to +4.00. These diopter values are the typical ratings for over-the-counter reading glasses, which help for reading at a close range. Carson Clip & Flip Magnifying Lenses are compatible with all types of eyeglasses.