SYN: Stimulant - although a true stimulant arouses the body to unusual activity. It is like a whip... used only in emergencies. It increases vital activity to much greater degree than a tonic.
Dr Kellogg says...
The success of hydriatic procedures depends as much upon the faithfulness and thoroughness of the attendant as upon the nature of the procedure itself. Every little detail must receive conscientious attention. No person can become qualified to administer hydriatic treatment in a satisfactory manner unless he is capable of following a prescription with absolute precision. p 406