The fitting and prism reference point should measure 63 with a tolerance of 0.33 Δ or 1.0 mm, depending on the power. Use a cutout chart to measure.
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If all is edged correctly with a PAL, then the PD should measure correctly? for instance, take a look at the pic below. It is a PAL and it's supposed to have a PD of 63 put end to end it is measuring...
Barry is correct the issue is how much do you compensate for the wrap. This was an issue before wrap frames became popular when we had to fabricate high base lenses I.e. cataract lenses 12 base and...
First you have to distinguish between the optics of a wrap glass and the mechanics of the same.
The optics pretty well covered above.
For the mechanics, try only thinking about a lens with a...
True/false? On PP9000's job, if the lab simply...
True/false?
drk 04-26-2024, 10:48 AMOn PP9000's job, if the lab simply hasn't compensated for the ~15 degree wrap, the 63 ordered would come back about 61 due to lack of compensation.
True/false?
That huge a...