Contact lenses have come a long way and are still advantageous for sports wear, social wear, etc., but are also becoming more available in multi-focal styles for the over 40 age group. People also enjoy wearing cool designer sunglasses over top. But contacts are a medical device that touches the cornea and have to be properly fit. Biocompatibility is important, and that includes ocular physiological health as well as good comfort and visual acuity, and appropriate hygiene considerations.