Do not pursue high refractive index lenses, for 500 degrees or higher, buy 1.6 indexes or more; below 500 degrees, buy 1.6 index lenses, if more than 1000 degrees, then buy 1.7 index lenses or above. You have to take steps to buy your prescription glasses: getting your glasses prescription and then buy your prescription glasses. Local optical stores sell glasses at high prices, it is very common that an eyeglasses frame will cost you several hundred US dollars. in fact, the glasses frames and lenses are not so expensive. Local glasses stores have to pay store rent, optometry equipment, store decoration, and workers' salaries, they must recover the cost, and at the same time, they have to make profits, that is why if you buy your glasses at your local store, you have to pay more. If you buy glasses online, ie from www.cheapglasses123.com, you will save a lot, you will save up to 80%.