The Telesight Clip-On Spectacle Magnifier is a binocular magnifying lens for eyeglasses designed for use by individuals with low vision. This magnifier clips on to the user's glasses frame and has two optical quality acrylic prismatic lenses with scratch resistant coating. The lenses have a flip up / flip down movement. Six available models differ in lens focal range (working distance) and power: model 22 has a 20-inch focal range and 1.5x power; model 23 has a 13-inch focal range and 1.75x power; model 24 has a 10-inch focal range and 2x power; model 25 has an eight-inch focal range and 2.25x power; model 26 has a 6 2/3-inch focal range and 2.5x power; and model 28 has a five-inch focal range and 3x power. SIZE: One size fits most.