Greetings,
I am writing to get a response to the subject of returning to CC Segs (ground in plus Clylinder) with laser surfacing.
It is true that with FT's and round segs the line would be less noticable facing the wearer face on. However, many labs are promoting that CC segs provide better acuity. Many years ago, we dispensed (no pun intended) with the glass CC segs, such as the CC ultex series, the barium and Flint CC round segs, etc., to provide the cylinder ground on the back surface. The reasoning then was to put the cyl. closer to the natural point of correction and thus providing better vision. Using the laser technology is fine - especially if, unlike normal surfacing where there is a + or - .25D variation in the power one always recieves pin point accuracy. If one orders a -6.00, they will get EXACTLY a -6.00. But, if the Cylinder is moved to the front surface, particularly in higher powers, are we not taking a step backward?
Your thoughts,
Sincerely,
Brian L. Schnirel
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