Hi Lou: I use trifocals with no gradual change from one to another. Close work and reading on the bottom, arms length in the middle, and long distance on top. For me the definite lens demarkation leaves no doubt which of the three lens I'm using. Mike Kurta -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20060522/fe272400/attachment.html
This PTG archive page provided courtesy of Moy Piano Service, LLC