Abstract
Presentation Description :
James Bailey*1, Philip B. Morgan2, Cliff Jones1 and Helen F. Gleeson1
School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
Eurolens Research, University of Manchester, Carys Bannister Building, Dover Street, Manchester, UK, M13 9PL
* Corresponding author: J.Bailey@leeds.ac.uk
Abstract:
Focusing on near objects becomes difficult as the lens of the eye hardens with increasing age. This inevitable condition is known as Presbyopia and it affects everyone over the age of 50. Currently, bifocal or varifocal spectacles are the most comfortable solutions for those that require both near and far vision correction. However, some people consider spectacles to be undesirable for cosmetic, sport, or other reasons. Multi-focal contact lenses are currently available, but they are not widely prescribed as it can take time for wearers to adapt to visualising both foci simultaneously. Instead, a contact lens that is able to controllably change its focus between near and far vision correction is more desirable. One possible solution is to use liquid crystal contact lenses, which can provide the required change in focal power (usually +2D) by applying a small electric field across a lens-shaped layer of liquid crystal. This changes the refractive index of the layer and hence the focal power. We review progress towards different dynamic contact lens designs, considering factors including: lens geometry; liquid crystal choices; suitable alignment modes; electrodes; and alignment materials. Each of these affects the operation of the dynamic contact lens and together can optimise such a device. We also discuss some of the challenges facing implementation of the prototype lenses as a commercial solution.
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.