Eyejusters are reading glasses with dials on either side, allowing you to "tune" each lens in real time:
"Two hidden dials change the lens power instantly—just like focusing binoculars," the eponymous company writes. The glasses feature "thin, lightweight adjustable-focus lenses made with our amazing optical technology." Unsurprisingly, they do not elaborate on how they work.
Each side is independently adjustable, and the lens strength range is +0.50 to +4.00 D.
The glasses run about $90, which is far less than I paid for my prescription reading glasses. I'm curious enough about these that I just ordered a pair, and will let you know if they work as advertised.
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Somebody hack a digital camera's auto focus & mount it on a frame. You can program a focus profile through your cellphone app. Just don't lose your phone or you'll be "looking" for the phone all day!
Remember this story you posted? https://www.core77.com/posts/112490/Low-Tech-Eyeglasses-with-User-Adjustable-Water-Lenses
I'm an impoverished American, and I'd dearly love to be able to get my hands on a pair.
Looks like the guy is peering through the bottom of a jam jar.
It works sliding thin lenses with opposite curvature past each other. Not sure how large a "sweet spot". https://www.eyejusters.com/technology/