For lurkers who are not sure what prism thinning is, here is a tour de force tutorial on progressive designs in general by the late great titan and Zeiss lens designer, Darryl Meister.
His knowledge and understanding of the differential geometry used in various designs, without the marketing mumbo jumbo (I'm talking about W.A.V.E. bull patties here), can be equaled by a few but surpassed by none.
If you are like me you read this once. Turn on a fan to clear the room of smoke that came out of your ears, then read it again and again and it eventually starts to sink in.
http://216.144.236.77/cecourse.php?u...essive_lenses/
How and why prism thinning is done is at the very bottom of the article.
Every "Course" he wrote from this Opticampus OB Forum that Steve Machol generously keeps alive is a must read if you want to be a better optician.
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