"Simulations of multifocal correction in SimVis technology are based on temporal multiplexing technique using a optoadjustable lens. These kind of lenses change their optical power when a certain voltage is applied. Multifocal corrections can then be simulated by a rapid change in the optical power of the lens, which covers all the values of optical power of the multifocal design faster than the fusion frequency of the eye, staying longer or shorter in each of them depending on the relevance of each optical power in the lens design. However, due to the dynamic properties of the lens (response time, inertia...) a sophisticated control of the electric signal sent to the lens is necessary if a highly accurate simulation is desired.
In the first phase of these project, several commercial multifocal lenses were selected and an algorithm was developed to obtain the temporal coefficients that allows simulating the same multifocal lens using our SimVis technology.
Then, the dynamic response of a set of optoadjustable lenses were characterized by calculating their impulse response using a ghigh-speed focimeter. An algorithm was developed to generate the electric signal that optimizes the optical response of the lens to replicate the one of the commercial multifocal lens.
The output optical performance was finally validated using a high-speed focimeter and comparing it with the commercial lens specifications.
The full process has been validated in generic lenses and in commercial lenses and has been published in two peer review papers:
- ""Akondi, V., Sawides, L., Marrakchi, Y., Gambra, E., Marcos, S., & Dorronsoro, C. (2018). Experimental validations of a tunable-lens-based visual demonstrator of multifocal corrections. Biomedical Optics Express, 9(12), 6302-6317.""
- ""Dorronsoro, C., Barcala, X., Gambra, E., Akondi, V., Sawides, L., Marrakchi, Y., ... & Marcos, S. (2019). Tunable lenses: dynamic characterization and fine-tuned control for high-speed applications. Optics express, 27(3), 2085-2100."""
