Ono's Oak Harbor is an attractive tortoise frame; lightweight and stylish for people who are performance oriented and prefer fit and function. Lens is constructed of opthalmic quality CR39 Polarized lens technology. Each lens incorporates a Polarized filter which absorbs the horizontal light thus eliminating reflective glare which increases visual accuity giving you sharp, crisp, glare-free vision with increased contrast and depth perception while outdoors. The Grey lens color is a perfect lens option for general all day every day use while outdoors. 100% UVA/UVB protection and Polarized filter offers the outdoor enthusiast the best in sun wear protection. Low-profile reader lens technology available in 5 magnification strengths starting at 1.50 through 2.50. The Oak Harbor frame style best fits the medium to large face.