The Altair Evolution Collection uses a perfect combination of today's colors, blended with cool retro designs to create affordable eyewear that is comfortable and trendy. Altair uses state-of-the-art materials to craft their signature eyewear frames: premium plastics, ultra-lightweight titanium, and color-rich stainless steel. Each pair of eyeglasses include demo lenses with a logo etched into the lens. These demo lenses are designed to imitate the real look of a prescription eyewear as close as possible to traditional prescription lenses. Demo lenses can?? be worn simply as a fashion statement. Upon receipt of the frame they must be replaced with real lenses by a local optical shop regardless of prescription strength even for a perfect vision.