We use only the safest lens material available, Polycarbonate. This ensures that every pair of prescription safety glasses we make is made to high impact standards. All lenses are hard coated on both sides to help prevent scratching. Single Vision $43.96 Flat Top 28mm Lined Bifocal $47.96 Flat Top 35mm Lined Bifocal $55.96 7x28mm Lined Trifocal $60.96 8x35mm Lined Trifocal $72.96 Progressive $92.96