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Making My Own Glasses

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Re: Making My Own Glasses

#141

Post by twodave »

bredren wrote: post #125
donjoe wrote: post #17

Everytime I read about glasses I have to think about the Luxottica-Monopoly which kind of controls most of the market and prices of glasses/lenses. https://www.latimes.com/business/lazarus/la-fi-lazarus-glass...

I remembered this as well. This bothers me, as I just had to get a new set and they are ridiculously expensive. I originally opened the article hoping that this was some kind of "I 3d printed my own frames" or something to that effect. I am hoping someone will figure out how to disrupt this industry.

I was hoping for the same. Still an interesting enough read to keep me until the end, though.

Re: Making My Own Glasses

#142

Post by littlecosmic »

I’m glad that a good result was had, but none of these results are that surprising if you have experience in ophthalmic optics.

The initial prescription and the final one are only a little different when you consider the change of acuity they can deliver (from a physics perspective). For a script like that, the frame choice, lens design and vertical placement of the optical centres (if the frame is a little deep) could all have a similar effect on acuity.

It is also very common for there to be differences like he found between an auto-refraction and a subjective refraction.

It’s possible that they are too focused in on the prescription itself and there are issues around the lens positioning/design that are involved here as well.

Re: Making My Own Glasses

#143

Post by phonebucket »

That was a great read, but one of the summary conclusions jarred with me a bit:

> Want to optimize your medication? Read up on all relevant studies and guidelines.

I am surprised to have seen this penned by a doctor. Relevant studies and guidelines are a minefield for amateurs.

Re: Making My Own Glasses

#144

Post by astura »

jqadams wrote: post #102
jefftk wrote: post #60

> Do you remember the process in which an optician makes you wear a new pair of glasses and stares at you with this optician-look, takes the pair of glasses away from you again, goes to the back office and starts bending parts of it in a seemingly random manner, comes back, hands you the pair of glasses which now suddenly fit perfectly? Yeah, I attempted to do that with my new pair of glasses and noticed that I suck…

Unfortunately, lots of places will refuse to fit/bend your glasses unless you got them from their stores. It’s just easier and less of a hassle for them to have a blanket ban vs worrying about breaking the person’s glasses and being charged/sued for it.

LensCrafters will fit/adjust any/all glasses for free without any questions. Bonus: there is usually one in most malls.

I've brought probably 10 frames there multiple times over the last couple decades, only one of which I actually bought there.

Re: Making My Own Glasses

#145

Post by andai »

nsxwolf wrote: post #113
JoeAltmaier wrote: post #111

Earlier quoted context omitted.

...and can be measured at home using a ruler and a mirror, pretty simply. Close one eye, align the ruler at 0 under that pupil. Open the other eye, close the first, read off the distance to the 2nd pupil.

Did this for my wife recently. We measured multiple times very carefully, and got it very wrong.

Did it for myself. Ordered online. Best glasses yet (I think mainly thanks to a my very patient optometrist.)

I measured by taking a picture of my face with a credit card for reference and measuring the pixels with the measuring tool in GIMP. (These were the actual instructions on the website I ordered my glasses from.)

Also worth mentioning I paid $40 ordering them online, in the article it says he paid $280!

Re: Making My Own Glasses

#146

Post by JiBB »

vanattab wrote: post #48
FPGAhacker wrote: post #44

Earlier quoted context omitted.

Inter-pupillary distance is among the few things glasses related that can be measured yourself.

It's a little hard to measure it by yourself but with a friend it's easy. Just make sure your looking far off into the distance and not at the persons face who is taking the measurement.

I found that the best way to get a nice, precise measurement was to take two pieces of sticky note and punch a hole in them with a pin. Put them on an existing pair of glasses and line up a distant (unless you're getting reading glasses) sharp corner with the pinhole over one eye. Switch to the other eye and see if the pinhole is lined up—if not, adjust the pinhole positioning and try again. Once the pinholes are aligned, you can measure the distance between them.

Much easier than trying to get someone to measure it accurately with a ruler in front of your face, or trying to draw dots with a washable pen in front of your eyes on old glasses, or any of the other methods I tried. The measurement I took appears to be accurate (the glasses I ordered from Zenni using it are comfortable to wear), and it was easy to get a precise and repeatable measurement to within about half a millimeter.

Re: Making My Own Glasses

#147

Post by e12e »

JoeAltmaier wrote: post #111
astura wrote: post #110

Earlier quoted context omitted.

That's cause PD is measured by the optician separately when you're ordering your glasses, not by the optometrist or opthalmologist who writes the prescription. In other words, it's not part of the prescription, it's instead part of the glasses fitting process. A non-eye related example would be if your doctor prescribed you a brace and the person at the medical supply store measured you to find out which size you nee…

...and can be measured at home using a ruler and a mirror, pretty simply. Close one eye, align the ruler at 0 under that pupil. Open the other eye, close the first, read off the distance to the 2nd pupil.

Maybe use a mirror, ruler and a camera?

Ed: i see @andai made a similar comment.

Might indeed be better to use a "long" object to indicate pixel length by division (credit card is 5432 px = 5 cm) rather than going by a ruler which might typically only be accurate to 0.5mm at best anyway.

Re: Making My Own Glasses

#148

Post by bonestamp2 »

I went for a Lasik consult recently and they said they have to dilate my eyes to get the most accurate reading since the muscles can compensate and give variable readings. It's true, my last two prescriptions differed from the reading they got with my eyes dilated. Maybe it was just an extra money grab but if it's true and I had known that before I would have asked them to dilate my eyes when I wanted to get glasses too.

Re: Making My Own Glasses

#149

Post by rconti »

stevekemp wrote: post #122
ThePadawan wrote: post #37

Earlier quoted context omitted.

I actually read up on the local legalese around this (for Switzerland), and it turns out that doctors can refuse to share information with the patient if they consider it unhelpful/dangerous to do so, but have to share it with other medical staff should they request it. Especially in the context of psychotherapy or when using placebos, this makes a lot of sense.

I found it fascinating, after moving to Finland and having an MRI scan done, that it was possible to order a copy of the results on CD-ROM posted to my house. Having worked in the medical field in the past exploring a DICOM dataset was no challenge, and the end result is I have a rotating 3D-view of my own brain! (Well just blood vessels, but still ..)

Here in the US, I got an MRI at a 3rd party lab (not a hospital), and they gave me a copy on CD-ROM as I walked out. I didn't even have to ask! I was quite surprised, as I assumed the results would just be shared with my doctor electronically. I have no idea if I would have gotten this same treatment if I had paid 10x as much for the MRI at Stanford Hospital. (I'm guessing not).

Re: Making My Own Glasses

#150

Post by rconti »

com2kid wrote: post #129
donjoe wrote: post #17

Everytime I read about glasses I have to think about the Luxottica-Monopoly which kind of controls most of the market and prices of glasses/lenses. https://www.latimes.com/business/lazarus/la-fi-lazarus-glass...

It is pretty easy to get non-Luxottica frames. Not too surprisingly, independent small batch production runs of frames end up costing a lot of money. There are also artisan frame makers who hand make the frames. If you are going to pay $300 for some frames, mine as well get an actual work of craftsmanship. At the end of the day, most Luxottica frames are actually far cheaper than the high end independent frames you c…

Yeah, I buy Bellinger Blac carbon-fiber frames. Hand-made in Denmark. Not cheap, but as a guy, it's about the only accessory I own.
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