Dictionary def. of ‘Collyrium’: -from greek “kollyrian”-pessary, eye salve -from “kollyra”- a roll of bread [suggesting Charaka’s collyriums are a soft pessary or pill or stick which is rubbed on the eye and melted.] -an eye lotion -an eye wash. "Sauvira Anjana" (a normal, soothing and tonic collyrium) should be applied daily to the eyes. "Rasanjana" (a mercurial collyrium) should be applied once every five or eight days for stimulating secretion.Notes: “vision is predominant in P, hence it is particularly susceptible to K; the measures alleviating K are beneficial for clarifying the vision.” [confirm this statement in Charaka.]"A sharp collyrium should not be applied at day, because the vision already weak due to evacuation is further depressed by the sun; evacuative collyrium should be applied only at night.

"The vision brightens undisturbed like moon in clear sky by collyrium, eye drops, etc." "The vision improves just as gold and other metals become brilliantly clean after polishing with oil, cloth, and brush."