Abstract
The ‘subregional frames’ considered by Mackay and Lakhtakia (ML) in their comment [Mackay, T.G.; Lakhtakia, A. J. Mod. Opt. 2007, 55, 323–328] to be noninertial within the ‘global perspective of curved spacetime’, are actually isomorphic to flat, inertial, Minkowski spacetime. Their claims of gravitationally induced vacuum negative refraction originate from the non-covariance of the criterion they used. When a covariant criterion is applied (as in [McCall, M.W. J. Mod. Opt., 2007, 54, 119–128; Phys. Rev. Lett. 2007, 98, 091102]) vacuum NPV does not occur. This argument is unaffected by noting that the sign changes of the metric eigenvalues were incorrectly stated in [McCall, M.W. J. Mod. Opt., 2007, 54, 119–128].
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