50.8 percent single vision, 20.7 percent bifocal/trifocal and 28.5 percent progressive as of 2011.Originally Posted by eyechick1969
http://bt.e-ditionsbyfry.com/print.p...d=124746&ref=1
In my shop, the percentages are less than 5 percent SV, about 40 percent bifocal/trifocal, and 55 percent progressive.
Science is a way of trying not to fool yourself. - Richard P. Feynman
Experience is the hardest teacher. She gives the test before the lesson.
you're a good word cop!
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