Hi-tech eyeglasses offer choice to bifocals

Prescription lenses that can change concentration from distant to nearby and behind again have been grown in Japan by TouchFocus.

When a sensor on a support is activated a glass crystals set into a reduce half of a eyeglasses change positions, altering a concentration in that area and permitting a wearer to see objects closer to them.

Touching a sensor again earnings a lens to your unchanging prescription.

Bifocal, trifocal or varifocal lenses already concede a wearer to use one span of eyeglasses to see during opposite distances though they are not suitable for everyone.

BBC Click’s Emily Bates reports.

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