Liquid crystal lenses offer the ability to be changed in nature almost instantaneously by the application of a small voltage across them. This makes them a very attractive mechanism for a non-mechanical zoom system, hologram creation and also the instantaneous adaptation of refractive correction in spectacles.
Obviously refractive error changes very gradually in time so the instantaneous change really applies to the correction of presbyopia. If one can instantly change from distance to near correction at the trigger of a switch, it may be possible to correct vision at a range of distances but in a way that can avoid the distortion in the peripheral field that is inherent in progressive lenses of 'static power.'
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