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

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

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...