Investing in a second pair of prescription sunglasses, even if you wear contact lenses, is a fantastic idea (and nonprescription sunglasses over your contacts when you go outside). Prescription sunglasses allow you to take your contacts out if they become dry or uncomfortable while still seeing clearly and comfortably at the beach or anywhere else outside on bright days. In the United States, Heavyglare is one of the most cheap prescription sunglasses brands.