APPLICATION OF MICRORELIEF PLANARIZATION BY PHOTORESIST FOR CHARACTERIZATION OF DIFFRACTIVE ORIGINALS AT PRODUCTION OF BIFOCAL INTRAOCULAR LENS «MIOL-ACCORD»

Bifocal diffraction-refractive intraocular lenses (BDRIOL) are widely used in ophthalmology for replacing natural lenses that have been clouded by cataracts. In Russia, the REPER-NN company has developed a manufacturing technology for such BDRIOLS which based on the frontal polymerization of a liquid photopolymer placed between two transparent quartz matrices. The direct measurement of the light energy distribution over the foci after the manufactured quartz diffraction matrix is complicated by the fact that the diffraction relief depth corresponds to the polymer lens operation in the intraocular fluid and is therefore significantly greater than is required when working in air. We have developed a method for the energy distribution measuring over the foci of the BDRYOL diffraction component which based on the time planarization of the matrix relief by a photoresist layer. The diffraction relief filling with a material with a refractive index of a given value higher than refractive index of fused quartz makes it possible to achieve light focusing conditions equivalent to working in the intraocular environment, and also to measure the light energy distribution across the foci under conditions close to the calculated light wavelength in the visible range. The primary task at the moment is to obtain such a photoresist refractive index, which will provide the relief depth of the intraocular lens diffraction component, corresponding to the work in the vitreous body of the eye. The work is devoted to the selection of drying conditions and the method of measuring the photoresist refractive index.