Quote:
Originally Posted by Spexxvet
What prompted me is that there is now a brand new (year old) completely different method of making PALs, called digital or free form surfacing. PALs have traditionally had the near vision power molded on the front of the lens, and a patient's distance Rx was cut into the back surface of the lens using what amounts to a cup lathe. With digital lenses, the front surface is spherical, and the distance and near vision powers are cut into the back surface, one "pixel" or point at a time using what amounts to a router.
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The digital one is probably easier to manufacture. You plug in some numbers and push a button. But does it make a better lens?
It's easier to do a sprayed popcorn ceiling, but a nice plaster ceiling is much higher quality. I expect easier to be cheaper.