The pupil can be recovered after the pupil is dilated, depending on the cause of the pupil dilatation, as follows: 1, can not be recovered: If trauma is caused, some people will cause traumatic pupil dilatation, some people recover from injury, the pupil has been in a dilated state, lifelong can not be recovered, later may do some glasses, or other surgical treatment to make the pupil back to a normal state. 2, can be recovered: If the examination The pupil is dilated due to the use of some medications, which are used purposefully, and after its effect is restored, the pupil can generally be fully restored to its original state, but the recovery time is different because of the concentration of the medication. Generally long-acting atropine sulfate ophthalmic gel, the recovery time may take about three weeks, while short-acting Safije may take about three days, compound tropicamide eye drops generally take six hours, half a day to return to a normal state.