| Revision as of 01:00, 2 July 2007 editStationNT5Bmedia (talk | contribs)1,473 edits history of the nomenclature for the vertometer← Previous edit | Revision as of 01:01, 2 July 2007 edit undoStationNT5Bmedia (talk | contribs)1,473 editsm →HistoryNext edit → | ||
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| == History == | == History == | ||
| The theory of geometrical optics uses ray tracing techniques. In many of his models, ] used a mathematical formula that measured a ] distance. This nomenclature prevailed throughout hundreds of years, during a time that studies of optics may have been misunderstood. Derived from the word, the measure of the focal length of a lens is represented by the reciprocal of the vertex distance in meters, or ]s. | The theory of geometrical optics uses ray tracing techniques. In many of his models, ] used a mathematical formula that measured a ] distance. This nomenclature prevailed throughout hundreds of years, during a time that studies of optics may have been misunderstood. Derived from the word, the measure of the focal length of a lens is represented by the reciprocal of the vertex distance in meters, or ]s. | ||
| == See also == | == See also == | ||
Revision as of 01:01, 2 July 2007
A vertometer is an ophthalmic bench instrument used to measure diopter power of a lens. It differs from a lensmeter or lensometer which is a general dispensory tool for opticians to verify spectacle prescriptions at the laborartory. A vertometer, on the other hand, is a more precision instrument used to locate, mark, and index a lens optical center for edging, mounting, and construction of a spectacle prescription.
History
The theory of geometrical optics uses ray tracing techniques. In many of his models, Galileo used a mathematical formula that measured a vertex distance. This nomenclature prevailed throughout hundreds of years, during a time that studies of optics may have been misunderstood. Derived from the word, the measure of the focal length of a lens is represented by the reciprocal of the vertex distance in meters, or diopters.
See also
References
- Bausch & Lombe Model 70 (includes picture of instrument)
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