The function of eyebrows is what people believed to keep moisture away from eyes such as while walking in the rain or excess sweating, but this is now definitely needless as the size of eyebrows have decreased dramatically (as compared to our ancestors) making it difficult to serve any such purpose and they barely protect our eyes from the salty sweat that irritates our eyes or rain that makes it difficult to see clearly while walking. So why do we still have them? Well, to answer this question, we need to imagine our faces without eyebrows. We are sure that one will never like their appearance without eyebrows and here comes the reason behind it: eyebrows play an important part in facial expressions, such as angry, sad, happy or lazy. One of the clearest ways to tell somebody what you're thinking is to simply move your eyebrows up or down -- we all know what different eyebrow positions mean. Eyebrows drops down as a result of ageing, making you look sad, more lethargic that you feel and affect your vision. Brow lift, also known as forehead lift, is well known cosmetic surgery procedure to correct this.