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 -~----------~----~----~----~------~----~------~--~---
