Glasses are the important element which determines a facial first impression.
The person´s impression is decided by what kind of glasses he had chosen. If an appropriated one was chosen, certainly can express his character and given a positive impression. However when doing in an opposite way, the feedback on image will be reversed.
There are no definite solutions of glasses which surely look really good on you, but TAIKOEYEWORK would like to introduce some of the critical points to assist you on decision making.

ROUND
Curved lines where the width and length of the face have the same proportions; there are no lines.
FIX ROUND
To make this face shape appears more oval, look for angular narrow frames. Mid or high temples to help lengthen. Colored temples to add width. Frames that is wider than deeper, such as an octagonal shape or rectangular.

OBLONG
Longer than it is wider. Characteristics of a straight cheek line and longer nose.
FIX OBLONG
Choose a lower bridge to shorten the nose. Dark frames to divide the length.

SQUARE
Characterized by a strong jaw line and wide forehead. Width and length are at the same proportions.
FIX SQUARE
Goal here is to soften the angles, and create a longer appearance. Look for frames that are longer than the widest part of the face, and that have more width than depth. Narrow ovals are an excellent choice.

DIAMOND
Shorter than it is wider & usually sharp in chin.
FIX DIAMOND FACE
Rimless glasses or frames that have more width than depth.

The eyes are perfectly sitting at the center of frame

The distance of frame is wider than the eye. Frame is too big.

The distance between eyes is wider than the frame & the lenses are sitting too close to lashes.

The frame sits too low on the face.

"Horizontal width of a Len" + "nose width (Bridge Width - distance between lens)"
= the total number of you to choose the right size of the glasses.