Thanks for the reply. The PD/lens size makes perfect sense, and I'm glad you guys have been happy with your Zenni lenses :o) I'm feeling more comfortable now and will be placing an order for a few pairs later today.
I posted another reply earlier to Lucille, but either it hasn't shown up yet or didn't go through. Either way, I'd like to thank Lucille and Chuck for their help, too. I also apologize for making a redundant thread...I sheepishly realized after I posted this that there are a few similar threads here already. Katie On Sep 2, 10:21 am, Paul <[email protected]> wrote: > The thickest appearing standard lenses I got from Zenni were in a > rimless pair. The prescription was -6.00, and the lenses were 46 mm > wide. They looked OK to me. The fact that they polish the edges of all > their lenses usually helps reduce the apparent thickness. > > Glasses are usually thickest at the outer edges. It can be minimized > by having the optical center of the lens be near the physical center, > and this depends on your PD and the width of the bridge and lens. > There have been a few discussions of this before. If I remember right, > ideally your PD would be equal to the lens width plus the bridge > width. Usually, the PD is less than this, and so most of the lens is > the part from the pupil to the outer edge, rather than being split > 50-50. > > For example, take typical set of numbers - a lens width of 50, a > bridge width of 17, and a PD of 60. The physical center of each lens > is going to be about 3.5mm closer to the outer edge than the optical > center. > > I have a pair with 38 mm lenses and a 26 mm bridge, and a PD of 62. > The outer and inner edges of the lenses are almost exactly the same > thickness. The lenses are fairly thin, even with CR39 plastic and a > -6.25 prescription. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
