Large and small eyes may be caused by acquired injury such as eye trauma, eye infection or facial paralysis causing abnormalities in the upper eyelid muscle, or may be caused by congenital developmental abnormalities resulting in a large and small eye, if the symptoms are obvious, you should consult a doctor in time, and according to different reasons to take different measures to improve the situation. 1. Acquired: eye trauma, eye infection or facial paralysis can cause large and small eyes, at this time the first conservative treatment. In this case, conservative treatment can be given first. The medicine mainly focuses on the nutrition of nerves, such as methylcobalamin, etc. If the effect is unsatisfactory, then surgery can be used to correct the problem. If the result is unsatisfactory, then surgery can be used to correct the problem. Clinically, eye size caused by trauma or scarring is mostly improved by surgery. 2. Congenital: If the ptosis is caused by congenital developmental abnormality, patients with mild ptosis can be improved by upper face levator folding; patients with moderate or severe ptosis can choose upper face levator shortening or combined fascia sheath corrective surgery; if the upper eyelid is in the state of myasthenia gravis, and the effect is poor after levator shortening or recurrence, then the frontalis muscle flap suspension or broad fascia suspension can be chosen. The main cause of ptosis is the longitudinal distance between the two eyes. In addition to this, the eyes may also be different in size due to the horizontal distance of the lid fissure or intraocular space-occupying lesions. If the two eyes are significantly different in size, it is advisable to consult a doctor to determine the cause.