Plastic optical articles

A plastic optical article wherein a transparent coating is applied to a surface of a transparent cross-linked resin having a glass transition temperature of at least 130.degree. C., wherein said transparent cross-linked resin is a copolymer obtained by polymerizing a composition which contains 20 to 98 wt % of a monomer represented by a general formula (A) and 2 to 80 wt % of a polyfunctional monomer having at least two unsaturated groups, and in which the total weight ratio of said monomer represented by the general formula (A) and said polyfunctional monomer having at least two unsaturated groups is at least 30 wt %, ##STR2## wherein R.sup.3 represents a substituent selected from the group consisting of hydrogen and C.sub.1 to C.sub.20 alkyl and alicyclic hydrocarbon groups, and R.sup.1 and R.sup.2 each independently represents a substituent selected from the group consisting of hydrogen, a methyl group and an ethyl group.