High-index lenses are advanced plastic lenses that are thinner and lighter than conventional plastic or glass lenses.
High-index refers to the lens materials index of refraction. A lens materials index of refraction describes the degree to which it bneds light. A high-index material has an index of refraction above conventional plastic (1.49).
The higher index of refraction enables the material to bend light to a greater degree. This results in a thinner lens because less curvature is needed for a given power. High-index lenses are generally lighter than plastic because they require less material to produce the lens. This means that a high power prescription can be achieved by an ultra-thin lens that is very light and attractive.
Even if you don't have a high prescription, you can enjoy the increased comfort and cosmetic benefits that thin, lightweight lenses provide.
Plus, most high-index lenses come with built-in ultraviolet protection to protect your eyes from the harmful rays of the sun.
