Although this can get a bit technical, take a look at http://www.laramyk.com/education/optical-theory/lens-form.html
If you look at the 3rd diagram, you'll see some of the different ways a lens can be surfaced, and why the different surfacing techniques can result in thicker/thinner lenses. -=# Firewalker #=- On Apr 16, 3:28 pm, BJ <[email protected]> wrote: > In my case the lenses are actually twice the same quality from the > same manufacturer. > > I had heard this term 'surfacing' before, but am not quite sure what > it means. So it is actually a way of making thinner lenses? > > It could be an explanation. But I find that strange, why would the > same company do it in some cases, and not in other cases? > > BertJan --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://www.glassyeyes.com! You received this message because you are subscribed to the Google Groups "GlassyEyes" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/glassyeyes?hl=en -~----------~----~----~----~------~----~------~--~---
