| http://www.w3.org/ns/prov#value | - A process for the production of a polyurethane lens, which comprises the following steps (a), (b) and (c)step (a): adding an alkyltin halide compound of the general formula (I)(R1)c-Sn-X4-c (I)wherein R1 is methyl, ethyl, propyl or butyl, X is a fluorine atom, a chlorine atom or a bromine atom and c is an integer of 1 to 3, to a polyisocanate [sic] compound,step (b): mixing two or more polythiol c
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