A lensmeter or lensometer (sometimes even known as focimeter or vertometer) is an optical instrument used in ophthalmology. It is mainly used by optometrists...

term manual lensometer, opticians may often refer to this piece of equipment as a lensometer, focimeter, or vertometer. The modern lensometer was invented...

whole lens: −13.4 diopters. The actual power, as read by a vertometer or lensometer, might differ by as much as 0.1 diopters. A lens clock can also be used...

curvature of a right-circular cylinder. Lapidary Lens clock Lens (optics) Lensometer  This article incorporates text from a publication now in the public domain: Chisholm...