Document Detail

Influence of the Base Curve in the Performance of Customized and Classical Progressive Lenses.
MedLine Citation:
PMID:  23357853     Owner:  NLM     Status:  Publisher    
PURPOSE: The aim of this article is to analyze the effect of the base curve on progressive power lens performance by means of the Sheedy scoring technique. We expect to find strong differences on this effect depending on the definition of lens power and on the lens optimization method. METHODS: We have used six different back side progressive lens designs. Three of them have been optimized for improving the power perceived by the user in the actual position of use. The other three have been optimized to provide prescription power when measured with a focimeter or a mapper. We have used exact ray tracing to compute both the user power maps and the focimeter power maps. We have applied the Sheedy method to these maps and analyzed the results. RESULTS: When this scoring technique is run with focimeter power maps, the performance of customized lenses is highly base curve dependent. Instead, classical lens performance is quite stable against base curve changes. On the contrary, if we run the test with user power maps, we find the opposite behavior. CONCLUSIONS: Progressive lens scoring is highly dependent on how the lens has been designed and how the lens is measured. Besides, customization of progressive lenses by real ray tracing guarantees that prescription and design parameters are preserved at the position of use regardless the base curve selected to make the lens.
Rubén Arroyo; Daniel Crespo; José Alonso
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-24
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:  2013 Jan 
Date Detail:
Created Date:  2013-1-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
*MS(Optom) †PhD Indizen Optical Technologies S. L., Madrid, Spain.
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