Prescription Water Sports Eyewear, Swimming Eyewear, Surfing Eyewear. Product Details: - Designed to accommodate virtually any prescription. - Total Power Range: 20.0D to -20.00D to -4.00D Cyl. - Hypo-allergenic silicone eye seals and strap. - Adjustable nose bridge. - Reusable plastic case. - Unique leak-proof lens bevel design. Special edging is required for leak-proof performance.