Glass Lenses - Glass lenses offer slightly better optics and are the hardest lenses to scratch. However, the disadvantages of increased weight and decreased safety make glass lenses less attractive for most patients. Glass lenses are also difficult to tint and when UV protection is applied to glass lenses, the lenses become slightly yellow. Polycarbonate Lenses - Rapidly becoming the lens of choice, polycarbonate lenses are the safest lenses available. Polycarbonate lenses can be tinted and are available in Transitions tints.
Polycarbonate lenses are also available in aspheric designs.