Hi there,
This is probably a dumb question but I need to be sure. A segment height is not always from the pupil to the lowest part of the frame i.e. in the case of bifocals. But pupil height must always be from the pupil to the lowest part of frame? Is there any other scenario where they are different?
Also whats the significance of a Box Centre Measurement? I understand it can be used to calculate the Blank Size needed, but couldn't I just use the A, B, ED and PD, DBL measurements?
Why would I need to know the geometric centre of the lens/frame etc. when all I need are these measurements?
Thanks in advance Everyone
RJ
Bookmarks