Abstract: The current disclosure relates to methods of designing a front surface toric soft contact lens with a substantially circular optic zone. More specifically, this disclosure describes a method to design a front surface toric soft contact lens which features a substantially circular optic zone with smooth transitions between the optic zone and the peripheral non-optical stabilisation carrier zone. The optic zone diameter is designed independent of the cylinder power and the shape, or curvature, of the back surface. This disclosure describes a method to design a front surface toric soft contact lens such that neither the edge profile nor the optic zone diameter is affected by the magnitude of cylinder power or the orientation of the cylinder axis.

Abstract: A dyeing method for functional contact lenses includes the following steps: providing a dry lens body, including hydrogel with 0-90% water content, silicone hydrogel with 0-90% water content, or a combination thereof; preparing an amphoteric polymethyl ether prepolymer, combining the amphoteric polymethyl ether prepolymer with a hydrophilic monomer to form a masking ring material, and attaching the masking ring material to an inner surface of the dry lens body to form a masking ring layer; dropping a colorant onto the inner surface, making the masking ring layer surround the colorant, irradiating the colorant with an ultraviolet light and then heating and fixing the colorant to form a dyed layer on the inner surface; and placing the dry lens body in water to hydrate and removing the masking ring layer to obtain a wet lens body.

Abstract: The present invention discloses a method for manufacturing a silicone hydrogel, including the steps of: preparing a polyethylene glycol-containing secondary or tertiary amino alcohol, a crosslinking agent having at least two epoxide rings, and a copolymerization mixture capable of performing a radical chain polymerization reaction, wherein the copolymerization mixture contains a linear silicone prepolymer, a silicone monomer, and a hydrophilic monomer, the linking process is activated by heating to let the epoxide rings of the crosslinking agent open and respectively link with the amino alcohol and any one component of the copolymerization mixture; and completing the radical chain polymerization reaction to obtain a silicone hydrogel. The present invention also provides a contact lens manufactured by the aforementioned method.