The causes of eyelid laxity and sagging include congenital and acquired, as follows: 1, congenital factors: the larger the eyes, the more lax the surrounding tissues, the performance of the outer side of the eyes sagging or bags appear; 2, acquired factors: more common, including age and environmental factors, due to the skin around the eyes is relatively thinner than other parts of the skin, with age, the skin around the eyes began to appear lax and sagging tissues; long term external stimuli, such as outdoor workers, workers, farmers and so on, due to ultraviolet irradiation, it may be more susceptible to laxity and sagging.