A synthetic resin lens as claimed in claim 10, wherein the lens substrate is formed from a copolymer of a monomer represented by formula (III): ##STR7## wherein R5 is a hydrogen atom or a methyl group, R6 is CH2 CH2 or CH2 CH(OH)CH2, X is hydrogen atom or halogen atom other than fluorine, and m and n are each an integer satisfying the condition of 0???m+n???8, and other polymerizable monomers.