Basic physics says that lenses focus best if both eyes look through the exact optical centers, and accurate PD's let you do this. Most people's pupils move a bit inwards a mm or two when they look close (mine don't), so there is no reason to assume your optician is wrong. They get lots of practice, as they do this with every single customer. If you don't trust yours to do something that common, you shouldn't trust them to do anything.
BTW, if the part of your nose that the glasses rest on is off center, you have two measurements, one from each pupil. Some glasses providers can accomodate that, some can't. It is not a difficult thing to measure - you can do it yourself in near vision, and get a friend's help in far vision. In addition, some lens suppliers can do it to .5 mm accuracy, some only to 1 mm. I suppose that if you have a very strong prescription, the difference might matter. -- Check us out at the oft-updated http://glassyeyes.blogspot.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
