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The arrival of TeV-energy photons from distant galaxies is expected to beaffected by their QED interaction with intergalactic radiation fields throughelectron-positron pair production. In theories where high-energy photonsviolate Lorentz symmetry, the kinematics of the process $\gamma +\gamma\rightarrow e^+ + e^-$ is altered and the cross-section suppressed.Consequently, one would expect more of the highest-energy photons to arrive ifQED is modified by Lorentz violation than if it is not. We estimate thesensitivity of Cherenkov Telescope Array (CTA) to changes in the $\gamma$-rayhorizon of the Universe due to Lorentz violation, and find that it should becompetitive with other leading constraints.

The CTA Sensitivity to Lorentz-Violating Effects on the Gamma-Ray Horizon