| Revision as of 04:15, 2 July 2007 editStationNT5Bmedia (talk | contribs)1,473 edits History naming the precision instrument← Previous edit |
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A '''vertometer''' is an ophthalmic bench instrument used to measure ] power of a lens. It differs from a ] or ] 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. |
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== History naming the precision instrument == |
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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. |
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== See also == |
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* ] |
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* ] |
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* ] |
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* ] |
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* ] |
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== References == |
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* ''(includes picture of instrument)'' |
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* ''R. Weldon Smith'' |
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