Mar 10, 2015
Trial Lens Case and Trial Frame
Wooden trial lens case lined with velvet and containing 40 Spherical and12 Plano-Cylindrical glass lenses, One Occluder, One Stenopaic Slit. Double Drop-cell trial frame. C-bridge. Engraved Axis scale, Joints at end of prominent lugs, Bowed straight sides with spatula tips. Produced by Down Bros. Ltd. Early 20th C.
There has been little change to this kit over the years - optometrists still use lenses and trial frames for assessing a patient's vision (although slightly more modern looking than this example).