I watched this video of how lenses are made a while ago: https://www.youtube.com/watch?v=xfhjWyAU9Cw

The technology has most likely advanced a lot which must have changed the production process but I don’t know how a hobbyist lens maker will find the hobbyist engineers who will create the sophisticated machinery for them to use. Also I am not sure if considering the high rate at which people are needing spectacles these days we will have the luxury to wait for the goddess of fortune to bless us with hobbyistd of the required presdisposition.

That… doesn’t strike me as too absurd a suggestion. Obviously it would be more complicated than that — the orderers would have to specify or test their eyesight before requesting a pair — but removing exchange value from the process sounds like an accurate (if very basic) prediction.

That said, the question is fundamentally flawed because it encourages planning speculation on the details of the future (in other words, it’s utopian socialism), which is hardly a worthwhile use of our time. The revolutionary classes are not going to simply give up on this problem when it arises or revert to capitalism to solve it; that would be silly.