INCREASED STIFFNESS CENTRE OPTICAL AREA IN SOFT CONTACT LENSES FOR ASTIGMATISM CORRECTION Russian patent published in 2015 - IPC G02C7/04 

FIELD: physics, optics.

SUBSTANCE: method of making a contact lens includes dosing material of optical quality into the front curvature matrix of a contact lens; placing a rear curvature matrix on the surface of the material and connecting the front and rear curvature matrices to form a contact lens matrix and curing the material by varying the intensity of curing light along the profile of the contact lens matrix such that the central part of the contact lens becomes stiffer than the peripheral part. A second version of the method includes depositing a first reaction inhibitor on the surface of the front curvature matrix of the contact lens; dosing material of optical quality into the front curvature matrix; depositing a second reaction inhibitor on the surface of the rear curvature matrix; placing the rear curvature matrix on the surface of the material of optical and superposition thereof with the front curvature matrix to form a contact lens matrix. The first and second reaction inhibitors must have a different composition and concentration. Material in the contact lens matrix is cured to form a predetermined stress profile.

EFFECT: reduced lens stabilisation requirements.

5 dwg