Although the purpose of glasses is to help you see better, the right color and shade can have a huge impact on the way you look - accentuating your strong points, diverting attention away from insecurities, and making you look more attractive overall. For example, choosing the correct glasses for a round face can make it appear longer and thinner. Rectangular frames are basically wider than they are tall. They come in various styles: sharp-edged frames convey a modern, architectural look, while more rounded rectangular edges give a softer, more understated look. Rectangular frames are great for round faces. The equal length and width of a round face can cause it to appear smaller than it is. A rectangular frame makes the face appear longer and thinner.