Unnatural dilatation of the pupils is produced by belladonna or atropia, hyoscyamus, stramonium, and other drugs. It may also result from paralysis of one of the nerves of the eye. It is frequently the result of rheumatism or of syphilis. It usually affects one eye, but may involve both. The sight is generally somewhat impaired.

The Treatment of Dilated Pupils - Mydriasis

Electricity is a remedy of value in this affection when it is not due to some acute disease of the brain. Benefit may also be derived from frequently closing the eyelids and compressing the eyes as firmly as possible, and also by frequent exercise in reading.