How to choose a perfect frame for your eyeglasses? The first one is the wearer's natural feature in which skin tone is the most decisive. Eyeglasses should repeat one's best natural feature, rather than offset it. A basic point of skin tone is that there are mainly two basic tones: cool and warm. Cool tone is always blue-based, and the warm tone is yellow-based. All people in the world fall into these two main categories, although there are some complex tones such as olive skin. In fact, olive tone is considered as cool because it comes from the combination of blue and yellow. When it comes to eye color, there are also cool and warm tones. Purchasing eyeglasses should take skin color and eye color into account. Eyeglass frames as well as lenses should complement the wearer's natural skin tone.