Large pupils in the eyes may be caused by dim surrounding light, intracranial hematoma, or certain medications.
1. Low ambient light: However, the pupil can change its size to control the amount of light entering the eye. When the surroundings are dark, the pupil adjusts to become larger to allow more light to enter the eye, which helps you see clearly.
2. Intracranial hematoma: rupture of arteries and venous sinuses in the meninges and bleeding from skull fracture increase the size of the cranial contents, while the skull is a rigid structure leading to increased intracranial pressure, resulting in the formation of cerebral herniation, compression of the arterial nerves, and the pupil on the diseased side appears to be enlarged.
3. Drugs: some drugs have the effect of dilating the pupil, and the use of the pupil range can be larger than normal. Common dilating agents are atropine, tropicamide and so on.
Large pupils may also be associated with epilepsy, shock and other factors, if the pupil can not be restored to normal size for a long time, it is recommended to go to the hospital, after a clear cause for treatment.