Mid index lens
High-index lenses reflect up to 50 percent more light than conventional glass or plastic lenses. For the best vision and appearance, it's a good idea to have an anti-reflective lens coating (AR coating) applied to high-index lenses. AR-coated high-index lenses transmit up to 99.5 percent of light to the eye for optimum vision. The 1.57 mid-index lens is best for prescriptions +2.00/-3.75 or below. It also features 100% UV protection.