Patent ID: 7803291

Claim:
A method of manufacturing a plastic lens, the plastic lens comprising a lens part and a flange part on a periphery of the lens part, the flange part having a flange surface on at least one side of the flange part, a depressed part formed on at least a part of the flange surface, an outer portion formed on an outer side of the depressed part, and a marking on the depressed part, the method comprising the steps of: preparing first and second molding dies, the first molding die comprising a first nested portion for forming the lens part and a second portion for forming the flange part, the first nested portion being separable against the second portion; positioning the first and second molding dies to form a mold cavity; and injecting a resin material to the mold cavity, the marking being formed by the second portion of the first molding die, wherein the second portion has a concave portion for forming the marking on a surface thereof that corresponds to the depressed part, and a position of a deepest point of the concave portion is shallower than a point of the second portion which corresponds to a highest point of the outer part.