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It's only $300 dollars and I never pay for glasses again. 
It pays itself off in 3 years. 
Maybe I can 3d print frames too. 
I was curious whether it was actually simple to duplicate a lens, so I started to look into how this works and I’m afraid you’re missing a couple steps. This machine only enables you to grind the edge of another lens to match an existing one, so you still need a lens, just not in the right shape yet.
I assume that when you get frames, they also send a model lens for a machine to copy, I don't know how lenses would get made any other way.
I think they're saying that this doesn't make the prescription. This copies the shape of the model lens but you need to feed it both the model lens and a finished prescription lens made by another machine so that this machine can cut out the needed shape.
In other words, you still need machine to grind the precise prescription into a circular blank I presume.
Yes, exactly.
E: whoops, didn’t mean to switch accounts
E2: oh, now I remember why that happened. Please come back online hexbear 🥲
Hmm, how much more do you suppose that is?
I have no idea what the machine is even called haha. It probably depends on whether you need just spherical or if you have astigmatism and need a cylindrical axis too.
You could probably partially DIY it with enough time and effort, huygen optics on YouTube does something like that, idk how complicated it is to make an astigmatism prescription.
I've thought about DIYing some of the glasses process, but only the diagnostic part. You can get that machine that lets you try basically any prescription for under like $1k, so you could use that to adjust your prescription and then try to order the actual lenses through somewhere online. Lens grinding seems tedious if you're doing it by hand without an expensive automated machine.
You can get that machine that lets you try basically any prescription for under like $1k, so you could use that to adjust your prescription and then try to order the actual lenses through somewhere online.
This might be a bit cheaper. More analog.
At a glance it looks like they only have 3 different strengths and no provisions for astigmatism. My interest is in fine tuning my prescription in increments of 0.25 as well as fine tuning my astigmatism in several degree increments so it wouldn't be of much use to me.
Edit: For anyone else curious about doing this on a budget, check out "trial lens sets", it's just a case of a couple hundred lenses you can get for around $200 that includes close to what looks like every prescription under the sun, including astigmatism and prism(!!). You're be manually swapping, stacking, and keeping track of every strength but it has strengths as low as 0.12 and looks like they include frames to pop them into.
I bought a trial lens kit from Amazon and printed an eye chart and then returned the kit afterward.
Still couldn't buy the glasses I needed without the prescription because they cracked down on the Internet sites that let you do that, but it was a cheap way to know I needed glasses before spending the money on an eye exam.
Sure, but all this machine does is cut the edge off one lens to match another, you still need a lens with your prescription that has been properly centered for cutting to the shape of your frame.
Oh how they keep the means of production away from me
Don't get silicosis 
What do you mean I can’t just constantly run production grade manufacturing equipment in my dining room? 😡
You're the one internet an-prims are talking about when they're like, "In my ideal society, if I need glasses I will simply barter with my buddy that has glasses making as their special interest"
buy the means of production
Lenses often have multiple special coatings eg to remove reflections and avoid lens flare from light sources, add UV protection or are extra hard against scratches. They also don't use the same cheap glass as windows. And after grinding, several polishing steps might be needed.
Looking at my prescription and the manual cutter, taking a guess, and ruining some lens material
The road to greatness is paved with trial and error
i don't know in the US but here the frame is the most expensive part. how many times do you change prescription for this to pay itself off in 3 years?
I generally get new glasses once a year
i changed my glasses this year without insurance (since it only covers glasses every four years) and it took around 15 dollars. how much more expensive can it be?
I think the cheapest I've ever purchased glasses for was $80
The price always looks fine until I enter my prescription.
There's a bunch of sites like Zenni where you can get dirt cheap prescription glasses. Even with having to pay for lenses made from unobtainium for my shitty vision and a couple of other upgrades I don't think I've spent more than $50 on a pair. They're not quite as nice as a $200 pair but they're more than close enough.
Wait is it for real
Yeah, this is just an Amazon listing
My pessimism tells me there's a catch but becoming a glasses trafficker seems pretty epic
Get in that Spinoza grindset