Dynamic presbyopia correction in the macular field of view by using a liquid crystal lens.

A large aperture matrix of tunable liquid crystal lenses (MTLCL) is used for dynamic presbyopia correction. The special electrode design and driving method allow the activation of local lenses at arbitrary lateral positions of the MTLCL. First, the study of tunable wavefronts, which can be generated by such a device, is presented. Then, the image quality at different viewing angles and distances is quantified. A driving algorithm has also been developed to increase the speed of focusing. It is shown that this device may provide continuous focus tunability (from 0 to 2.5 diopters), react within 0.5 s, operate with relatively low voltages (<5 V), and enable diffraction-limited on-axis aberrations. Finally, the results of a comprehensive evaluation of its performance with human subjects are reported, comparing the visual acuity (VA) achieved by using the approach proposed in this project against the natural human VA for objects in the near field.