Adlens variable focus eyewear. What a fascinating technology! I had no idea these existed

[astro]

See

Prescription VR Lenses | Made in UK | Meta, PSVR, PICO, Lenovo Legion

Surprisingly they are not that expensive.

Alvarez lens technology

Each lens comprises two wave-shaped polycarbonate plates that are able to slide across one another. The power of each lens can be varied by moving the plates relative to one another, as shown in the diagram.
Fluid-Compression lens technology

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Fluid-Injection, variable focus lens technology

Each variable focus lens comprises an elastic membrane held in a chamber between rigid front and back polycarbonate plates. When fluid is injected into the chamber the elastic membrane bows outwards or inwards to change the power of the lens, as shown in the diagram.

[astro]

Youtube video

[phouka]

I remember seeing something about this when a global charity was trying to find a way to supply the poor in Africa with glasses. Even polycarbonate lens grinding is too expensive and time consuming to get glasses out on the scale needed. The version I saw was very clunky and ugly, but it was affordable. Nice to see they’ve found a fashion outlet for them.

[Man_With_a_Cat]

They still look more or less clunky and ugly, but if function trumps form for someone, they’re a neat option.

[Dragwyr]

This is not a new idea. Superfocusglasses have been out for at least the past 4 years.

[panache45]

@Dragwyr

This is not a new idea. Superfocusglasses have been out for at least the past 4 years.

But the Superfocus are way more expensive, although they don’t have those ugly dials on the sides.

[Leaffan]

@panache45

But the Superfocus are way more expensive, although they don’t have those ugly dials on the sides.

The dials are removable, after you’ve set your focal length.

[JWT_Kottekoe]

I remember Louis Alvarez showing me a pair of adjustable lens eyeglasses about 40 years ago. According to a Google search, he invented them in 1964. His glasses worked by sliding two lenses with complex shapes across each other. This was commercialized a few years ago by Focus on Vision.