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Dear Darryl,

I can confirm:

- The index is correct
- The generator requires prism in degrees
- We measure the prism at the blocking center

I'll take the thickness measures you suggest and...

Thank you Harry.

Anyway, those links contain formulas involving decentration. My goal is not to decenter the lens but just blocking the blank tilted with our automatic blocker or tilt it on the...

Hi all,

This is my first post. Your discussions helped me a lot and I want to thank you all of you!

We've got in our LAB the following prescription:

Sph: 0.00 Cyl +0.50 Ax 75 Prism 6DP base...