In June of 2023, I just bought a new pair of eyeglasses from Zenni for $85 (including shipping) -- and they are progressive bifocals in a nice frame.
I visited Dr. Tetrault again June 21, 2012 for an exam, and got the following numbers:
SPH CYL AXIS ADD PD OD(right) -175 -225 170 +225 33 OS(left) -325 -100 175 +225 33He measured my PD as 66/63 (the 66 number is what I want to order glasses, the 63 number is for "near vision" if I understand him right.
During this visit, he mentioned that several of his clients have ordered and been happy with glasses from Zenni Optical.
Before this update in 2012, my prescription was:
SPH CYL AXIS ADD PD OD(right) -225 -225 164 +200 34 OS(left) -375 -100 178 +200 33The PD in the above is the one-sided pupilary distance (from the center of my nose), most folks just want the sum of these (68mm), the "interpupillary distance".
My curent frames (2009) say 55  19/141
My son Paul has a pair of round frame Zenni frames I like: 157825
I may try "Discount Glasses" at some point in the future.
In April of 2013 I finally actually ordered a set of glasses online (from Zenni Optical). I was shocked when they arrived, they are superb. A pair of progressive bifocals in a titanium frame for $72 (plus shipping). I could have picked out a less expensive frame ($10), paid the $22 for the progressive lenses, addes $5 for tint and have a $37 pair of sunglasses. And I just might.
Zenni offers 3 levels of tint: 10, 50, and 80. The advice I find is that
you want to select the grey (as I will) or the brown. The 10 percent tint
is for "fashion", whatever that means. The 50 percent tint is the mainstream
choice, but the 80 percent tint is what you want for outdoor use in bright sun,
or daytime driving. Note that the G-15 "Rayban" tint is an 85 percent tint.
Conclusion: order the 80 percent tint.
I have some single vision "reading" glasses, but they are set up for 20 inches, which is much closer than I want to work. My usual computer screen distance is more like 30 inches, or a bit more.
So here is my 2012 prescription from above.
SPH CYL AXIS ADD PD OD(right) -175 -225 170 +225 33 OS(left) -325 -100 175 +225 33The first trick is that dividing the 225 add value by 2 yields 112.5 and the convention is that all things optical are done in steps of 25 (quarter diopter). Apparently this is not entirely true, and you can get glasses made with 1/8 diopter steps, but the general word is it doesn't matter, and go down.
Note that if we just throw the ADD value away, we get a single distance prescripton -- for distance. The ADD value adds to the SPH to give the near vision part of a bifocal. So adding less gives more of a distance prescription. Anyway, I decided to go with an ADD value of +100 and an overall PD of 63 (not 66) as mentioned above. So I ordered (on 2-2-2022) from Zenni, a pair with this prescription for $44:
SPH CYL AXIS OD(right) -075 -225 170 (overall PD=63) OS(left) -225 -100 175
As a comparison, here is the prescription for some more aggressive single vision close-up glasses I had made. These work well at a distance of about 19 inches, which is too close for me at the computer:
SPH CYL AXIS OD(right) +075 -200 164 (overall PD=65) OS(left) -050 -100 175It looks like these were done with an add of +250 (my full amount)
Zenni does not do a relensing service, but this outfit does, and seems totally cool about how they charge for it:
Tom's online eyeglasses notes / email@example.com