Regrettably, since cosmetic surgery is a product of the West, the criteria of beauty that most doctors learn are based on Western standards. There's a principle in Western aesthetics called the "golden ratio," for instance, that is considered the ideal proportion between the lips and the width of the nose or between the lips and the eyes.
說來遺憾，由於美容科技是西方產物，因此大部分醫生的美容法則也就只能套用西方標準，例如西方美學上有所謂的「黃金比例」，即一比一．六一八，如果鼻寬和嘴唇、或是眼睛和嘴唇能照這個比例，基本上就算合乎標準。