Look sexy and fun on the beach or country club with these stylish retro vintage sunglasses. These heart-shaped, smoky-lens sunglasses offer protection against excessive exposure to light, including its visible and invisible components. The most widespread protection is against ultraviolet radiation, which can cause short-term as well as long-term ocular problems such as photo keratitis, snow blindness, cataracts, pterygium, and various forms of eye cancer. Medical experts advise the public on the importance of wearing sunglasses to protect the eyes from UV rays; for adequate protection, experts recommend sunglasses that reflect or filter out 99-100 % of UVA and UVB light, with wavelengths up to 400 nm. Sunglasses, such as the pair for sale here at Dogbotz Boneyard, that meet this requirement are referred to as "UV400." This is slightly more protection than the widely used standard of the European Union.