Thinnest lens on the planet. The Crystal Vision 1.74 High Index lens is a good choice for the highest corrections over +/-8.00. Crystal Vision lenses are made by one of the world's largest lens company making top quality lenses. All Crystal Vision Lenses are made in the U.S., to exacting specifications, in an Essilor laboratory, and we are able to offer them at a great price point. This lens is a good choice for corrections up to +/-4.00, and it is available with a variety of options such as Transitions, UV protection, sunglasses or fashion tint, standard Anti-Reflective coating, and the top-quality Crizal Alize and Crizal Avance coatings.