Sorry if I went off on a bit of a tangent. I can't speak to the quality of the offshore product, obviously. In fact, they might actually do a great job with odd prescriptions, and finding out is a pretty cheap gamble.
In order to get a perfect answer to your question, you will need to compare your prescription with those of other people who've used the service. Good luck.
One of the problems in getting a good fit is determining the optical center of your eyes. Just because a particular frame fits two people well, that doesn't mean their eyes are in the same positions relative to the frames. If all you need is simple dioptric correction, this might not matter, but if correction for astigmatism is required, you want the lens "centered" over the eye.
An optician puts a gadget over your eyes that lets them determine where the pupils fall. The lenses are then ground with their optical centers at those points.
For this reason, I would not have a Web or overseas company grind the lenses. Costco should be cheap enough.
You keep reading all the street signs. The signs, you read them for about thirty to sixty seconds, and they all leave you wondering what you just read? Like the street sign that used to say "Main" and "State" which now says that "we are very concerned about making sure that people make the right choices. Which is why Hillary! has proposed an immediate $50 million increase in spending to study the matter of helping people to choose the right street at this intersection".
I got Lasik surgery and my vision (for the first time) is 20/20 or slightly better. The surgery also corrected my astigmatism. I plan to recycle all my useless frames to a special Goodwill box. Wow, hard to believe frames can be so expensive!
Off that site, a cheap pair of frames and lenses is ~$35.00USD (including shipping!) I can have multiple pairs and if I lose one, no big deal ... that site certainly looks good to me. As long as the area of corrected vision is large enough on the lenses--should work fine. Height of the pupil can be adjusted with adjustment of the nose pieces or padding.
I don't plan on wearing these glasses to see the king--just for work where something always happens to 'em!
Ever misplaced a pair of glasses, grabbed your backup and lost them? Everything stops until at least one set is recovered.
Uncrewed the leftover part of the frame and it is the size of a nut. I thought there might be some stem left, but no. This seems undoable. I once repaired plastic frames by screwing an eye-screw into the frame with a similar fracture. I wonder if I can't solder an eye screw (looks like the letter P) in there. In the toirtoise shell plastic glasses, the eye screw repair looked darn near invisible.
Heck, it would almost be easier to twist the frame 90 degrees and put a hole in perpendicular to the flat side and run the screw through that.
You need the Rx to include pupilary distance. Zenni doesn't ask for temple size but since you are getting measured, might as well get those numbers too.
You don't understand. It takes a small number of stock lenses to cover almost all the population for single-vision lenses. All you need are small set of increments of spherical powers crossed with a few astigmatic cylinder increments. These are stocked as big circular blanks.
Size and shape to fit the frame, PD centering, astigmatism angle, etc., are all fitted with a jig that cuts the big round blank to a final shape, center, and cylinder angle. The "optician" doesn't grind the optical surfaces.
Now, bifocal adds, progressives, extreme Rx powers, are another matter. But even those tend to be jobbed out to factories, not done by local craftsmen any more. And those factories are increasingly found overseas in an age of air transport.
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