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Thanks Mike,

Danish or not - you're a star. You got the point exactly!!!!

Hi xiaowei,
I am starting to think that my original question has been misread. I have no argument with back surface progressives giving wider fields of view and with regards to the keyhole effect...

Thanks for that AWTECH,

Are you saying that regardless of whether we use a front surface design with 18mm minimum height or a back surface design with 18mm minimum height, like the one...

As more and more manufacturers are following the 'Freeform' route, we are faced with a seemingly endless choice of Inner Surface Progressive lenses. The literature accompanying these lenses clearly...

:idea:OPTICALC XL is a multi function optical calculator that is written as an Excel spreadsheet. It should be useful to dispensing opticians and lab technicians alike, and is very simple to use. The...