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. 
this post was submitted on 26 Dec 2025
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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.