Composition for plastic lenses

A composition for plastic lenses which comprises

• (A) 10 to 60 parts by weight of a polybutylene glycol di(meth)acrylate represented by the general formula (I):
• ##STR8## where R.sup.1 is hydrogen or methyl, and n is an integer of 5 to 16;
• (B) 20 to 80 parts by weight of at least one compound selected from the group consisting of a urethane poly(meth)acrylate having two or more (meth)acryloyloxy groups in the molecule, and an epoxy poly(meth)acrylate having two or more (meth)acryloyloxy groups in the molecule;
• (C) 5 to 60 parts by weight of at least one mono(meth)acrylate selected from the group consisting of compounds represented by the general formulae (II), (III), (IV) and (V):
• ##STR9## where R.sup.2 is hydrogen or methyl, R.sup.3 is an alicyclic hydrocarbon radical having 5 to 16 carbon atoms, R.sup.4 is hydrogen or methyl, R.sup.5 is --CH.sub.2 --,
• --CH.sub.2 CH.sub.2 --O--, ##STR10## or --CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 --O--, X is chlorine, bromine or iodine, m is an integer of 0 to 3, p is an integer of 0 to 5, q is an integer of 0 to 4, and r is an integer of 0 to 3;
• and
• (D) 0 to 60 parts by weight of a compound having at least one polymerizable double bond in the molecule,
• with the total amount of components (A), (B), (C) and (D) being 100 parts by weight.