Try on the CK21521 at your local Clarkson Eyecare location. These red designer eyeglasses from Calvin Klein are perfect for focusing at work or relaxing at home. Made from plastic, these eyeglasses feature a design and can help you see clearly with prescription lenses. At Clarkson Eyecare, we can build a complete pair of Calvin Klein CK21521 just for you, with custom lenses designed for your vision needs.