Prescription lens fitted to eyeglasses frames is for the purpose of correcting vision problem. As your prescription power gets stronger, higher index lenses are used in order to reduce the lens thickness. For a little bit strong prescription, the lens is usually very thick on the edge with 1.60 index lenses. So, please try to avoid rimless and semi-rimless frames if possible. Full-rim frames would achieve much better aesthetic result than rimless and semi-rimless frames. This is because the rim of the full-rim frames will cover the lens edge in some degree. While in semi-rimless or rimless frame, the thick edge would be easily visible. Hope this helpful.