Compare them to the "theoretical" numbers from the online thickness calculator.
http://www.opticampus.com/tools/thickness.php -- Chuck Knight On Tue, Jul 7, 2009 at 12:43 PM, Michael S<[email protected]> wrote: > > Hello all, > > I've just received my first pair of glasses from goggles4u, also the > first pair I've bought online. I've had the same pair of store-boughts > for 4 years, but my prescription has changed considerably, and I > decided it was time to try the net. > > I ended up selecting a half-rimless frame (http://www.goggles4u.com/ > detail.asp?Pid=32330), and decided to spring for the Polycarbonate > lenses, as I am error prone and want these to last a while. I am > fairly sure my last pair of glasses had polycarbonate lenses, as we > opted for the second lowest package at America's Best or wherever it > was, and I was very satisfied with them. > > The pair that just arrived, however, is a little perplexing to me. The > lenses seem very thick, at least 1.75x as thick as my old pair (and I > don't think my scrip has changed *that* much), and look, well, very > plastic-y, as compared to my old pair. They have a ridge along the > sides of lens that I think is necessary for them to sit in the frames > properly, and I'm wondering if they might've cut CR39 lenses because > that thickness is necessary for the frames I picked. > > Is there any way I can tell by looking if the lenses are CR39 or > Polycarbonate, or maybe taking them in to a local shop? I'll probably > keep the glasses either way, but if they switched the lenses on me, > I'd at least like to know so I can apply for a refund of the higher > cost. > > Notes: My Scrip: Right Eye : Sph -3.50, Left Eye : Sph -3.00, Cyl > -1.00, Axis 177, everything else blank. > Also, you might want to be careful with the frame measurements on > goggles4u, as sometimes they'll have entered incorrect measurements. > Usually, if the frame has their 360' view option, you can get a look > at the actual measurements as printed on the frame itself. I don't > really mind this, just giving a heads up. > > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
