Ah. Wow, yeah it does appear I bought into the marketing :( I have been wearing glasses for the past 10 years and this is my 4th or 5th pair (first pair purchased online). What I failed to realize is that the brick and mortar shops charge extra for the index that Zenni sells as its baseline. In the past they would tell me polycarb is the premium lens and hit me up for another $100 or so to have it put in with AR etc..
Prior to my awareness of the thickness calculator, I was also going on the assumption that the frames I selected were not as small as ones I had owned previously and that that would make the lens edge too thick. Thanks for the correct info. On Mar 10, 8:52 pm, "[email protected]" <[email protected]> wrote: > Chuck, > > optiboard is useless as it requires to register to get access to that > calculator (typical for optical "professionals" whom try to hold all > info for themselevs to corner the market! ... :-). So I found one > which is freely available without > such:http://www.opticampus.com/tools/thickness.php > > You need fill in the dimensions of your glasses as well as > perscription and material. Note that the Poly used by Zeni is already > quite high index at 1.57 vs. the regular CR-39 which is only 1.49. > > Saint, > > Looks to me you may have just wasted your money to go to 1.67 as you > don't have that such number. You can try using the above calculator to > check the exact thickness difference in your case. Do not believe > marketing pitches optical shops, and sometime Zenni may try on you > (they did try on me, with a perscirption around +6.5 and I told them > no thanks, I want actually the poly material for its strenght so they > just did it and it came fine with the standard 1.57 poly lens, thinner > than the usual CR-39). Now the optics is different and there are > various opinions on what is better, also actually Poly is cheaper to > make as it is made from palets of plastics that are injected molded > into a mold. Anyway, poly also naturally blocks UV light etc etc > > Now I did try the above calculator with your perscirption for the > right eye. The thickness with the 1.67 comes to: 1.6mm in the center > and 5.6mm at the edges. With the poly its 1.5mm center and 6.1mm > edges, not even 1mm difference at the edges (actually just 0,5mm diff > for edges and 0.1mm diff for the center...!). So I'm sorry to suggest > that you may have lost your money (don't know if you were asked by > Zenni to order in 1.67 in which case this is not right for your case > or if it was you whom decided such on your own.. in which case.. its > OK the sales pitch from the B&M stores kept working on you...). > > I will post above reference of the calculator on a separate thread for > all to enjoy. > > Cheers! > > Cheap --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
