UV-Resin Self Adjusted Prescription Glasses

As someone who doesn't wear glasses I'm equally amazed and disappointed at their invention. Yes, a simple pair of lenses and a frame can convey sight, great. But, the invention of glasses has effectively devalued my perfect sight. In medieval times I'd be sent for as the chap who knows things AND can see. I'd be medieval rich, whatever that looks like. Anyhow, being able to see is great, corrective lenses can do this quite well. But, large parts of the world are conspicuously devoid of 1hr prescription lens stores.

Since quite a lot of the assessment of eye sight is just asking people if things look better or not, to some extent people can choose their own prescription. One way this was used for glasses was quite ingenious. I can't find the original, but here's the similar idea <link>. Basically, two clear plastic membranes, separated by water constitute the lens. The magnification is changed by simply adding or removing water to change how much the membranes bulge in the middle. In the version I saw, this was done with a syringe, the wearer would look at things and change the pressure on the syringe until things looked good, then lock off a valve and remove the syringe to have a wearable pair of glasses.

This is great, only there will always be the possibility of leaks be they from damage, or just the way liquid containers behave over long periods. So how to get around this?

Simple, instead of water, we use one of the many UV curable resins currently popular in one type of 3D printing amongst many other applications.

Using the resin, the wearer pushes/pulls the syringes until the best possible prescription is reached, then, goes outside for a wander about in the sun. The UV resin will cure quickly in sunlight and in a few minutes the lenses will be solid plastic. Now, the membranes, syringes and possibly some/all of the frame can be removed leaving sleeker more durable user-made glasses.