The PD is the pupil distance. Your PD is 63.5 total A lens is a circle with a centre that gets cut into the shape of a frame. When the person who is making your glasses "marks up" the lenses to be cut into the frame she marks the optical centre of the lens, tells the cutting machine the dimensions of the frame and the lens is cut.The optical centre of the lens is automaticly centered at the point of your PD. if the Optimum vision is not achieved through where YOUR PUPIL sits behind the lens then it has not been cut properly. I think you are trying to learn too much about your glasses and you are over analysing, and you have ended up missing the point entirely by attempting understand all this by yourself with no qualified optician to help you reach these strange conclusions!! .You dont need to try and find a frame that has the centre near the centre of your pupil!! The lenses are centred.Why do you think they even take a PD? - to put the optical centre right on it!!
On Jun 4, 11:24 am, Paul <[email protected]> wrote: > I forgot to mention one thing about getting well-centered lenses. It > finally sunk in from your note (after only half reading another post a > long time ago) that the way to do it is to get bridge width plus lens > width (really half of one lens width plus half of the other lens > width) to be close to your PD. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
