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Jessica Jarosz, Quentin Lavigne, Norbert Molliex, Guilhem Chenon, Guilllaume Noetinger, Duc-Duy Tran, Bruno Berge; Experimental optical analysis of an original presbyopia-correcting variable focus lens. Invest. Ophthalmol. Vis. Sci. 2018;59(9):255. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
The final aim of presbyopia-correcting adaptive eyeglasses is to offer a way of recovering natural lens adaptation and thereby clear vision at all distances in all situations. The optical requirements are challenging: the adaptive lens must provide the 3-diopter-high necessary addition, in a continuous way, with a response time around the typical accommodative response time, on a wide field of view and with a high-quality ophthalmic lens. We show here the capability of the Laclarée technology with a detailed characterization of its optical response and of the optical quality of the lens.
The core of the Laclarée technology is an opto-fluidic engine which integrates a variable focus lens made of two liquids and a micro-fluidic pump providing the actuation pressure required to deform the membrane embedded in the lens which forms the optical diopter. We set up several in-house benches to test our sub-systems separately and put together, in terms of optical power, actuation pressure and optical quality.
We account for the optical power characterization of our integrated lens with the characterization of each component of the opto-fluidic engine and highlight the efficiency of our system. We demonstrate how hysteresis can be electronically canceled to lead to optimal optical response. With around one hundred volts and a few hundreds of microamperes, we reach an actuation pressure of 200 Pa and manage to obtain the requested 3-diopter addition. Regarding optical quality, the modulation transfer function assessed through our varifocus lens reveals a high-quality lens. Also, the Laclarée technology has been integrated into curved-form lens to benefit from the optimization of off-axis visual performance through base curve and avoid undesired front-surface reflections.
The Laclarée technology achieves the 3-diopter amplitude over a wide field of view. Thanks to its soft actuation technology, high deformation of the optical diopter with low energy is made possible. Moreover, the visual performance of our adaptive lens meets the standards on ophthalmic lens. This is clear evidence that this technology is a serious alternative to current corrective solution for unsatisfied presbyopes.
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.
Typical response of our variable focus lens assessed with a magnification analysis ; the four grid images illustrate the increase of the optical power with voltage through the increase of the grid interval
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