There were so many helpful comments about my spectacle disaster, that  
I want to a- thank everyone and b- report:
Today I picked up my new glasses- so-called DST bifocal lenses. (yes,  
new frames do look a bit like welfare glasses!). The lenses are so  
incredible: no fish-eye distortion. I think they'll let
me see a beam as straight on not curved! I settled on varilux brand.

While I was digging around, I found this study which Bullas, who feast  
on technical arcana, might find interesting.

Mary


Comparison of Bifocal and Progressive Addition Lenses on Aviator  
Target Detection Performance
http://www.aoa.org/x5343.xml


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M.V. Tegel, hands-on impresario
Tegel Design + Planning
551-914-1171

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