Analysis of the recording of multifocal lenses in photopolymers for intraocular applications

The introduction of a mathematical sequence into a diffractive lens phase, such as the Fibonacci or Silver Mean Sequence, allows us to achieve multifocal behavior in the Fresnel regime. This study explores the use of photopolymers based on Polyvinyl Alcohol Acrylamide (PVA/AA) as an optical recording medium for these complex lenses. PVA/AA photopolymers were selected because of their versatility and good response in recording DOEs. Moreover, the use of a 4F optical system configuration and a Spatial Light Modulator (SLM) provides the flexibility to adjust lens radius and orders, enabling the creation of lenses with adaptable focal lengths and specific sizes. In addition, we model the material's behavior using a 3D diffusion model with a coverplate and index matching, allow us to adjust some parameters to obtain higher diffraction efficiency. These lenses find practical applications in microscopy and ophthalmology, particularly as progressive intraocular lenses. Their ability to adjust focal points and sizes makes them invaluable for addressing vision problems, like presbyopia and enhancing optical devices used in medical and research settings.