EnChroma (Derby) Cx3 Sun Color Blind Glasses- Outdoor (sunglasses), Ideal for deutan, protan color blindness Metal frame Proprietary color-enhancing spectral filter lens non-polarized Lens width: 51 millimeters Lens height: 40 millimeters AWARD-WINNING PATENTED SPECTRAL LENS TECHNOLOGY: Backed by 10 years of optical research, EnChroma glasses are on on the cutting edge spectral len technology. 100% SATISFACTION GUARANTEE No Risk, 60-Day Money Back Guarantee and 2-year Product Warranty. 100% UV PROTECTION WITH COLOR IMPACT: 100% UVA and UVB absorbing and maximum color impact. BEST-IN-CLASS LENS MATERIAL: Each lens is made with Trivex, an optical-grade resin for lightness, clarity, and impact protection. CLARITY-ENHANCING, DUAL SURFACE, ANTI-REFLECTIVE LENSES EnChroma lenses are anti-reflective on both sides of the lens to maximize clarity and reduce haze so you see the world the way it truly is. You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!