  I comment on two recent papers on Kerr effect as evidence of gyrotropic order
in cuprates, and I suggest that the arguments may not be sound. The difficulty
is that in practically all cases the wave vector $k_{z}$ perpendicular to the
copper-oxygen plane is not a good quantum number. This appears to be
problematic for arXiv:1212.2698, whereas in arXiv:1212.2274 the symmetry
arguments may turn out to be robust, but the microscopic picture is wanting.
Thus, the Kerr effect in cuprates remains a puzzle, as there is little doubt
that the arguments presented against time reversal symmetry breaking appear to
be rather strong in both of these papers on experimental grounds.
