What Are High-Index Lenses for Eyeglasses?
High-index lenses are an alternative choice to standard, plastic eyeglass lenses. Although high-index lenses are more expensive than plastic lenses, they can reduce the thickness and weight of an eyeglass lens, particularly for individuals with a strong prescription. For most prescriptions, high-index lenses offer the same optical clarity as plastic lenses in a significantly smaller package. An eye care professional or optical laboratory is the best source for determining what lens index should be used for a given prescription and eyeglass frame.
