It is not so easy to choose a proper pair of eyeglasses during purchasing as we have to take many aspects into account, among which the primary aspects are eyeglass frames and lenses.
Regarding eyeglass lenses, they can be evaluated from the perspectives of materials, thickness and other such factors. If they are used for cosmetic purposes, the lens color should also be taken into consideration. In addition, some doctors or eye care experts would suggest using such special lens coatings as anti-radiation coating, anti-reflection coating, etc. to protect our eyes.
As for the eyeglass frames, they can be classified into two main categories according to their materials such as metal and plastic, and each category can be subdivided into several various groups. eyeglass frames can also be classified based on the differences in their structures. For example, some frames have integrated nose pads; while others have flexible or adjustable nose pads.
All what mentioned above are, of course, not the only ways to classify eyeglass frames. Sometimes, you may have heard that there are round or rectangular eyeglass frame. Actually, they are designed in accordance with the face shapes of human beings, which include six basic types, namely, oval, round, square, oblong, base-down triangle and base-up triangle. You can get a most suitable eyeglass frame for yourself if you know well which frame fits your face shape.
Consequently, it is necessary to take the face shape into consideration when we are purchasing an eyeglass frame. An appropriate eyeglass frame will make you look much prettier; on the contrary, an inappropriate frame will make you look so bad. For instance, people with round or oval faces should wear rectangular frames so as to make their faces thinner and longer; while, oblong and square faces are fit for round-like frames to avoid the apparent face angles; the rest two face shapes should be provided with special frames as well. Generally speaking, frames for base-down faces need to be widened to the upper face, and those for base-up faces require to be widened at the bottom.