Document Detail


A Comparison of Four Different Lens Mappers.
MedLine Citation:
PMID:  25259757     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: Recently, a number of lens mappers have become available for measuring the detailed optical properties of progressive addition lenses (PALs). The goal of this study was to compare the results obtained from several different lens mappers for a range of different lenses.
METHODS: The optical power maps of six lenses-two single-vision lenses, a parallel-sided slide, a flat prism, and two progressive lenses-were measured using four different lens mappers: the Dual Lens Mapper, the Nimo TR4005, the Rotlex Class Plus, and the Visionix VM2500. The repeatability of the instruments was also evaluated.
RESULTS: All lens mappers gave very repeatable measurements; however, measurements among the lens mappers varied considerably. Differences appeared to be above the tolerance at the optical center for measurements of single-vision lenses, and these differences increase in the periphery up to 1.00 diopter. Similar differences were observed for the PALs, even increased by prism and base curve effect, with figures greater than 1 diopter in the periphery. The measurements made on the prism and lenses with different base curves suggest that base curve, thickness, and prismatic effect can all contribute to the differences among instruments.
CONCLUSIONS: Measurements of a given lens taken with different lens mappers can vary substantially. Particular caution should be exercised when interpreting power maps for PALs taken with different instruments.
Authors:
Denis Larrue; Morgane Legeard
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-9-25
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  -     ISSN:  1538-9235     ISO Abbreviation:  Optom Vis Sci     Publication Date:  2014 Sep 
Date Detail:
Created Date:  2014-9-26     Completed Date:  -     Revised Date:  2014-9-27    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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