«عینکهای «فوکوس خودکار» نوید بینایی واضح، نزدیک یا دور را میدهند»
ire lens area. “One can always glance over the dynamic area,” he says. If wholly self-adjusting lenses emerge then safety will become “a much more serious business”, he adds.
In 2013, UK firm Adlens released glasses that allowed wearers to manually change the optical power of the lenses via a small dial on the frames. These lenses contained a fluid-filled membrane, which when compressed in response to dial adjustments would alter its curvature.
Adlens’ current chief executive Rob Stevens says the specs sold for $1,250 (£920) in the US and were “well received by consumers” but not so much by opticians, which he says “strangled sales”.
Since then, technology has moved on and the concept of lenses that refocus themselves automatically, without manual interventions, has emerged.
Like IXI and other companies, Adlens is working on glasses that do this. However, Mr Stevens declines to confirm a launch date.
Joshua Silver, an Oxford University physicist, founded Adlens but no longer works for the company.
He came up with the idea of fluid-filled adjustable lenses back in 1985 and developed glasses that could be tuned to the wearer’s needs and then permanently set to that prescription.
Such lenses have enabled roughly 100,000 people in 20 countries to access vision correcting technology. Prof Silver is currently seeking investment for a venture called Vision, which would further rollout these glasses.
As for more expensive, electronics-filled auto-focus specs, he questions whether they will have broad appeal: “Wouldn’t [people] just go and buy reading glasses, which would more or less do the same thing for them?”
Other specs tech is even slowing down the progression of eye conditions such as myopia, beyond just correcting for them.
Prof To has developed glasses lenses that have a honeycomb-like ring in them. Light passing through the centre of the ring, focused as normal, reaches the wearer’s retina and allows them to see clearly.
However, light passing through the ring itself is defocused slightly meaning that the peripheral retina gets a slightly blurred image.
This appears to slow improper eyeball growth in children, which Prof To says cuts the rate of short-sightedness progression by 60%. Glasses with this technology are now in use in more than 30 countries, he adds.
British firm SightGlass has a slightly different approach – glasses that gently reduce the contrast of someone’s vision to similarly affect eye growth and myopia progression.
While autofocus glasses and other high-tech solutions may have promise, Prof To has an even bigger goal: glasses that don’t just slow down myopia but actually reverse it slightly – a tantalising prospect that could improve the vision of potentially billions of people.
“There is growing evidence that you can do it,” teases Prof To.
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Experts have raised questions about information not included in the preliminary report, writes Theo Leggett.”
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