Autofocus glasses!
What with the inexorable march of time etc, I find it harder to change focus from near to far.
These glasses have refocusable lenses (from some horrible cheap dial-eye specs), a couple of little linear servos to drive them, and a couple of endoscope camera modules to track my eyes.
The focus is adjusted based on where my eyes are converging.
Unfortunately, the lenses are really nasty. I can't find any focusable lenses between the cheapest nastiest plastic (used here), and incredibly expensive custom optics.
The cameras are also not terribly good (poor low light performance, too narrow fov).
I'm definitely going to revisit this one. It needs some decent eye tracking cameras and IR leds. It's tempting to make the frame entirely as a PCB, including custom servos.
How do these lenses change their focal distance? I could only find a vague description ("a slider pushes fluid around") with a quick Google search. I assume there are two pieces of plastic and fluid inbetween, but don't know whether the shape is adjusted by increasing/decreasing the pressure of the fluid, or whether it's done by applying force to one of the pieces of plastic directly, or maybe in some other way?
@robryk This one uses alvarez lenses (https://gcamp6f.com/2018/09/27/alvarez-lenses-and-other-strangely-shaped-optical-elements/) - there are two parts with a wave shape to them. As you slide them horizontally against each other, different parts of the wave line up, producing a different lens shape and changing the focus.
I got them from some AliExpress 'dial vision' specs.