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

opticians may often refer to this piece of equipment as a lensometer, focimeter, or vertometer. The modern lensometer was invented in 1922 by Edgar Derry...

measure the intensity of photogenic rays; and in 1849 he brought out the focimeter, for securing a perfect focus in photographic portraiture. He was elected...

focimeters ISO 9342-1:2005 Part 1: Test lenses for focimeters used for measuring spectacle lenses ISO 9342-2:2005 Part 2: Test lenses for focimeters used...