Method for manufacturing of optical element, optical element thus obtained

Abstract

The present invention relates to a method for the manufacturing of an optical element having a refractive index above 1.59 by additive manufacturing to the optical element obtained by such a method and to an ophthalmic lens comprising such an optical element.

Description

technical field [0001] The invention belongs to the field of optical devices, especially the field of manufacturing optical elements with high refractive index (greater than 1.59). [0002] More specifically, the present invention relates to a method for manufacturing optical elements having a refractive index greater than 1.59 by additive manufacturing, to optical elements obtained by such a method, and to an ophthalmic lens comprising such an optical element . Background technique [0003] In the ophthalmic industry, it is desirable to obtain high index polymers (ie, greater than 1.59) to reduce the thickness of prescription lenses when high diopter corrections are required. [0004] Prescription plastic lenses exhibiting a high index of refraction are typically manufactured by a casting process that involves a very long polymerization cycle of pouring a liquid monomer mixture into a mold and hardening to produce a solid polymeric material. In particular, after filling w...

AI Technical Summary

Problems solved by technology

[0008]However, it is difficult to identify such monomers, especially to balance the viscosity of the polymerizable composition with the refractive index of the final polymer

Acrylic / methacrylic monomers are often used as reactive solvents to reduce viscosity, but tend to lower the refractive index of the corresponding final polymer

In contrast, high-index monomers often contain fluorene compounds or aromatic groups, resulting in high-viscosity systems that are incompatible with polymer jetting techniques

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