Suruma is called as 'ohal' in unani medicine technology.Kohal is the sufool [ fine powder] , applied on the eyes or on to the inner surface of the eyelid, with the help of a thin stick or at times applied in a solution form mixed with water or oil for the base.

It is a fine powder form of the medicinal preperation used externally to strengthen the eyesight and to cure certain eye ailments.