The 50% off lenses promo code mind50 allows for a discount on the price of lenses and add-ons with the purchase of an eyeglass frame or pair of prescription sunglasses. More Info » frame purchase required. offer may not be used on contact lenses, costa products, kaenon, zeal, maui jim, or oakley prescription sunglasses. promotion can be used on costa and oakley eyeglasses. promo code valid before any shipping costs and/or any applicable taxes are added. cannot be used in conjunction with other offers or price match guarantee. offer ends march 29, 2017.