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...
Make sure the fresnel is smaller than the lens you applying it so it doesn’t touch the frame. Add a few drop of dish detergent to the water it will work wonders in eliminating bubbles.
If all is edged correctly with a PAL, then the PD...
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...
Prentice Pro 9000 04-26-2024, 08:52 AM