Polymerizable polyol (allyl carbonate) compositions

A polymerizable composition is described, which composition comprises a polyol(allyl carbonate) monomer, e.g., diethylene glycol bis(allyl carbonate) monomer, and an additive represented by the general formula,wherein R2 and R6 are each selected independently from hydrogen, C1-C20 linear or branched alkyl, cycloalkyl having from 5 to 7 carbon atoms in the cyclic ring, aryl, C2-C20 linear or branched alkanoyl, cycloalkanoyl having from 5 to 7 carbon atoms in the cyclic ring and aroyl, R2 and R6 each being free of radically polymerizable ethylenically unsaturated groups; R3O and R5O are the same or different; R4O is different than each of R3O and R5O; R3O, R4O and R5O are each independently a divalent residue of an epoxide; x and z are each independently a number from 0 to 200, provided that the sum of x and z is greater than zero; and y is a number from 3 to 200. The additive is present in the composition of the present invention in an amount at least sufficient such that a polymerizate of the composition is substantially free of tinting defects, such as ferns and moons.