What is left eye jumping?

People always think that the left eyelid jump money, in fact, from the ophthalmologist's point of view, the left eyelid jump is the body to give you a warning, because the eyelid jump is the involuntary contraction of the orbicularis oculi muscle movement, this situation mostly indicates that the biological clock disorder, may be the recent pressure is very large, lack of sleep or deep sleep caused by the excitement of the cerebral cortex.