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What's that machine they use at the eye doctor to bend/refit your glasses? (lemmy.world)

submitted 7 months ago by [email protected] to c/[email protected]

21 comments fedilink hide all child comments

I like getting glasses off of Zenni but they never seem to fit quite right, mostly the arms. Would be nice to be able to make adjustments.

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[–] [email protected] 16 points 7 months ago (1 children)

The closest I’ve been able to get to it is to submerge the arms in hot (nearly boiling) water for a bit, and then make the adjustment. It’s not quite as effective, but depending on what the frames are made out of it can do the job in a pinch.

[–] [email protected] 7 points 7 months ago* (last edited 7 months ago) (2 children)

Hm at what temperature do the lenses melt?

[–] [email protected] 7 points 7 months ago

https://www.wikipedia.org/wiki/Polycarbonate

Probably ~130C but I would not gamble on this. I have no experience in lenses like this or their specific plastic composition. I just know most are based on polycarbonate, have made my own corrective reading, and my own anaglyph, glasses.

[–] [email protected] 6 points 7 months ago

my lenses didn't melt but I have definitely fucked up the coating by walking into a sauna for just a minute which is very far below 100c