Adjustable focus reading glasses with fully-adjustable lens strength from -6 to +3 diopters - eliminate the need for multiple pairs of glasses with variable focus technology for instant clarity - features Alvarez dual lens technology for near, intermediate and far distances - flexible frames with comfortable nose pads and impact scratch resistant polycarbonate lenses - designed for nearsighted, myopic and farsighted users - helps prevent eye strain with customizable power-adjust design - perfect for men and women of various ages and prescriptions.