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.