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Automatic measurement of varifocal spectacle lenses
Author(s) -
Fowler C. W.,
Sullivan C. M.
Publication year - 1990
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1990.tb01112.x
Subject(s) - lens (geology) , stepper , repeatability , stepper motor , optics , aperture (computer memory) , computer science , optometry , engineering , physics , acoustics , mathematics , medicine , mechanical engineering , statistics
An instrument is described for the automatic measurement of lens power across the whole aperture of a varifocal lens. The apparatus is based on an electronic focimeter controlled by an external computer, which also positions the lens by two stepper motors. Methods of display of the data are discussed, and the repeatability of measurement is illustrated.