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Crystals 2018, 8(1), 29;

Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia

School of Physics and Astronomy, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
Eurolens Research, University of Manchester, Carys Bannister Building, Dover Street, Manchester M13 9PL, UK
Author to whom correspondence should be addressed.
Received: 15 October 2017 / Revised: 8 January 2018 / Accepted: 9 January 2018 / Published: 12 January 2018
(This article belongs to the Section Liquid Crystals)
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Presbyopia is an age-related disorder where the lens of the eye hardens so that focusing on near objects becomes increasingly difficult. This complaint affects everyone over the age of 50. It is becoming progressively more relevant, as the average age of the global population continues to rise. Bifocal or varifocal spectacles are currently the best solution for those that require near and far vision correction. However, many people prefer not to wear spectacles and while multifocal contact lenses are available, they are not widely prescribed and can require significant adaptation by wearers. One possible solution is to use liquid crystal contact lenses that can change focal power by applying a small electric field across the device. However, the design of these contact lenses must be carefully considered as they must be comfortable for the user to wear and able to provide the required change in focal power (usually about +2D). Progress towards different lens designs, which includes lens geometry, liquid crystal choices and suitable alignment modes, are reviewed. Furthermore, we also discuss suitable electrode materials, possible power sources and suggest some methods for switching the lenses between near and far vision correction. View Full-Text
Keywords: contact lens; switchable lens; liquid crystal; presbyopia; wearables; corrective optics; healthcare contact lens; switchable lens; liquid crystal; presbyopia; wearables; corrective optics; healthcare

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Bailey, J.; Morgan, P.B.; Gleeson, H.F.; Jones, J.C. Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia. Crystals 2018, 8, 29.

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