Optic Trial Lens Frame Description: Optometrist tool used for fitting and prescribing eyeglasses. Origin: Circa 1920-1940; United States Taylor’s Percussor (Percussion/Reflex Hammer) Geneva Lens Measure (AKA Lens Clock/Watch) Leave a ReplyCancel replyComment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.