The material used for 1.67 high-index lenses is typically MR-7, or other similar high-index plastic materials, which are designed to be thinner and lighter than traditional lenses while providing superior optical clarity.

Refractive Index: 1.67 is a high-index plastic material that allows lenses to be thinner and lighter than standard lenses, such as those made from CR-39 or polycarbonate. The higher refractive index reduces the lens thickness, making them aesthetically more appealing, especially for higher prescriptions.

Thin Profile: Because of the high refractive index, lenses with a 1.67 material are significantly thinner than standard lenses, especially for people with higher prescriptions, offering both comfort and a stylish look.

Lightweight: Lenses made from 1.67 material are lighter than standard plastic lenses, reducing the overall weight of your eyewear, making it more comfortable for daily wear.