Droopy eyelid refers to the abnormally low position of upper eyelid, which is known as ptosis or lazy eye. Usually droopy eyelid is caused by three possibilities. One possiblity is that people might get ptosis through hereditary. It is so called congenital cause. Another very common cause for ptosis is aging. As we aging, our skin and muscles are getting deteriorate and sagging for collagen and elacity loss. This is very common and evitable. Lastly, it might be caused by abnormal development of levator muscle which is mainly used to elevate the upper eyelids. This abnormality might be resulted from some eye surgery, eye tumor, neurological disorders or some systematic disease like diabetes. From introduction above, you can see eye dryness won't cause droopy eyelids. So far, the best treatment for droopy eyelids is surgery. For congenital or aging causes, there seems no effective way to prevent it. As to the abnormality of the elevator muscle, it is complicated. I think it is better for you to discuss with your oculist. Find out the underlying root and then you can find proper prevention and treatment.
