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Off‐axis measurements of a plano distance power progressive addition lens
Author(s) -
Atchison David A.,
Kris Michy
Publication year - 1993
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.1475-1313.1993.tb00482.x
Subject(s) - lens (geology) , spectrum analyzer , optics , prism , optical axis , optical power , physics , rotation (mathematics) , mathematics , laser , geometry
To test that the Humphrey Lens Analyzer can be used validly to measure off‐axis powers of progressive addition lenses of low distance power, we made measurements of a piano distance progressive power tens with both a conventional focimeter and the Humphrey Lens Analyzer. The use of the Humphrey Lens Analyzer in two modes, one in which the lens related about a point corresponding to the centre‐of‐rotation of the eye (mode 1) and one in which (he lens rotated about its back surface centre of curvature (mode 2), gave off‐axis power measurements which were similar to those of conventional measurements. In addition, the Humphrey Lens Analyzer in mode I gave prism measurements which were similar to conventional measurements. The Humphrey Lens Analyzer in mode 2 gave prism measurements which were less than those of conventional measurements, but the prism contours were similar and the differences were < 1 Δ within 20 mm of the lens centre.