Provided is a thioether-functional, oligomeric polythiol having pendant hydroxyl functional groups, prepared by reacting together: (a) a compound having at least two thiol functional groups; (b) a hydroxyl functional compound having triple bond functionality; and (c) a compound having at least two double bonds. Further provided is a thioether-functional, oligomeric polythiol having pendant hydroxyl functional groups, prepared by reacting together: (a) a compound having at least two thiol functional groups, prepared by reacting together: (1) a dithiol, and (2) a compound having at least two double bonds; (b) a hydroxyl functional compound having triple bond functionality; and optionally (c) an additional compound having at least two double bonds, which may be the same as or different from the compound (2). Optical articles prepared from the thioether-functional, oligomeric polythiols are also provided.