KZFOO has literally changed my life! I have a prescription that is normally very expensive and hard to find. Until KZFOO no online source could grind my lens prescription but because they grind their own lenses they are able to provide me with very affordable glasses. For the first in my life I am able to have multiple pairs, even sunglasses! What used to cost over $500 a pair is now under $100! And the quality is top notch!