TY - JOUR T1 - Trail of trial lenses JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 1449 LP - 1449 VL - 92 IS - 11 AU - Richard Keeler AU - Arun D Singh AU - Harminder S Dua Y1 - 2008/11/01 UR - http://bjo.bmj.com/content/92/11/1449.abstract N2 - Courtesy of Mr Richard Keeler, Curator, museum of the Royal College of Ophthalmologists, London. Photo: Mark Thomas The itinerant spectacle seller was using trial lenses in the form of pairs of lenses held in a frame as early as the 17th century. In 1838 … ER -