Your prescription is really quite mild and I would think most optical professionals would not recommend the added cost of a 1.67 index lens. I would think that minus prescriptions would only really benefit from 1.67 when you start pushing -6.00 or so. Plus corrections can benefit around the +3.00 and up range.
Thickness is only part of the equation when considering 1.67 or 1.74 index lenses. The magnification/minification affect is usually a much larger factor. Many hyperopic patients are very disoriented when wearing anything other than high-index lenses. The other factor is weight. High index lenses are more dense than regular lenses, thus making them heavier. The thinner lens helps reduce weight, but again, in your prescription it's unlikely you'll benefit from anything higher than a 1.60 index lens. On Tue, Mar 10, 2009 at 8:00 PM, saint <[email protected]> wrote: > > Well, I think the thickest part of the lens is more like 5-6mm. > > I bought http://zennioptical.com/cart/product.php?productid=810&cat=3&page=1 > > with a script of > > R-Sph: -4.5 > R-Cyl: -1.25 > R- Axi: 17 > L-Sph: -3.25 > L-Cyl: -1.5 > L-Axi: 10 > > I'm thinking maybe my script is not strong enough to show enough > difference between the 1.57 and 1.67. > > On Mar 9, 8:56 pm, Chuck Knight <[email protected]> wrote: >> About 6 months ago, we tried to quantify the difference in thickness between >> regular 1.56 index lenses, and the commonly available high index options. >> We figured out that the difference in thickness should be around 15-20%, in >> most cases. That number is admittedly from memory...but should be >> reasonably close. >> >> Assuming that your lenses are 5mm thick on the regular pair, the high index >> pair should be around 4mm thick. >> >> Would this be consistent with your experience? >> >> -- Chuck Knight >> >> P.S. Optiboard has an online lens thickness calculator that makes >> discussions like this moot. But, knowing what percentage to take off gives >> us a different way to gauge what we get. >> >> On Mon, Mar 9, 2009 at 10:29 AM, saint <[email protected]> wrote: >> >> > Just received them today via DHL Express. Looks like they came >> > directly from China, not via California. >> >> > Have been wearing them for a couple of hours and so far I think they >> > are pretty good. I can tell the vision field has changed somewhat, >> > which I think can be attributed to the fact that the frames are >> > slightly larger than my previous ones. One thing I'm not sure of is >> > if I did indeed actually get the high index 1.67 lenses put into these >> > glasses. I purchased two pair, one for regular use and the other are >> > sunglasses. Though the frames are not the same for both pairs, they >> > are of similar size, and from what I can tell, the lenses look >> > virtually indentical in thickness. The reference point being that you >> > are not allowed to order high index lenses for the sunglasses. >> >> > On Mar 8, 5:55 am, "[email protected]" <[email protected]> >> > wrote: >> > > i received mine today, within two weeks of ordering. Don't give up on >> > > them yet, both pairs were great!!! Good luck!!! >> >> > > On Mar 4, 2:41 pm, saint <[email protected]> wrote: >> >> > > > Hi. >> >> > > > I ordered 2 pairs of glasses from Zenni on Feb 4. >> >> > > > 1. Single vision with AR coating and 1.67 index lens. >> > > > 2. Single vision with AR coating and 80% grey tint. >> >> > > > Total came to about $97. Can't beat that of course... >> >> > > > Both pairs were ordered with same script and I received a confirmation >> > > > email within 5 minutes after ordering. >> >> > > > On Feb 18th, I wanted to checkin, and sent an email to Zenni using the >> > > > lab email stating the following: >> >> > > > ~~~ >> > > > Hello. I would like to know the status of order #506782 , placed on >> > > > 02/04. Has it been shipped yet, and if so could you please direct me >> > > > to tracking number? >> >> > > > Thank you for your support. >> > > > ~~~ >> >> > > > I got a reply 2 days later stating: >> >> > > > ~~~ >> > > > 02.19.09 >> >> > > > Re: Order #506782 >> >> > > > Dear Customer, >> >> > > > We will ship your glasses from the lab in China in about three days, >> > > > and you should expect to receive the order within approximately >> > > > another week. The time may vary slightly depending on your location. >> >> > > > Thank you for selecting Zenni Optical for your vision needs. >> >> > > > ZOCS: EZ >> > > > ~~~ >> >> > > > I emailed them again on March 1 and as of yet have not heard anything >> > > > back. >> >> > > > Should I be concerned? Everyone has received their glasses eventually >> > > > right? > > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
