Ms. Polina E. Konoshenko Profile

Polina E. Konoshenko

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Proceedings Article | 12 September 2021 Presentation + Paper

Development of method for measuring a light energy distribution over foci for mould of diffractive component of bifocal intraocular lens

V. Korolkov, P. Konoshenko, S. Mikerin, D. Belousov, A. Malyshev, S. Golubtsov

Proceedings Volume 11873, 118730G (2021) https://doi.org/10.1117/12.2597112

KEYWORDS: Refractive index, Photoresist materials, Diffraction, Silica, Liquids, Diffractive optical elements, Manufacturing, Intraocular lenses, Eye, Polymers

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Bifocal diffractive-refractive intraocular lenses (BDRIOL) are used in ophthalmology to replace natural lenses that are clouded by cataracts. In Russia, the REPER-NN enterprise developed a BDRIOL manufacture technology on the base of a liquid photopolymer frontal polymerization placed between two transparent fused silica moulds. One of them has a spherical shape, the other has a flat surface with a diffractive optical element (DOE). In our BDRIOL design the diffractive structure depth changes so that the energy distribution over the foci weakly depends on the pupil diameter. Zeroth and first orders efficiencies should almost the same. Measurement of this distribution is complicated due to the diffractive profile depth corresponds to the operation of a polymer lens in the eye and is significantly greater than required for working in air. We have proposed to use temporal planarization of the diffractive mould to measure energy distribution over foci. The diffractive structure is filled with a material that provides approximately the same module of refractive index difference with fused silica as between the polymer and vitreous body of the eye. This difference is adjusted by the temperature and time selection at the photoresist baking. The sign inversion of the refractive index difference in comparison with the operating conditions in human eye changes the DOE focus to positive. The paper discussed specific photoresist treatment, refractive index measurement and preliminary results of the developed method.

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