The n and k for MAPbX3 have been observed to vary between representative processing methodologies to date. If such process-induced optical dispersion variation is ignored at the design stage, PSCs can exhibit undesired parasitic optical absorptance by non-perovskite (non-active) layers resulting in variable optical transmission, reflection, or haze-like characteristics within solar radiation bands of interest (i.e., ultraviolet = 300-400 nm, visible = 400-700 nm, and infrared = 700-2500 nm). To our knowledge, no comprehensive experimentally appended optical dispersion data analysis to derive the optical constants of MAPbX3 has been performed to include notable anomalous optical dispersion characteristics including the sharp band edge transition (bandgap ~539 nm) and methylammonium spectral overtones below the bandedge (observed around 1050-2500 nm). As such, the optical property determination of exemplary MAPbX3 has been largely under approximated and, consequently, evokes uncertainty with respect to optical properties reported in prior work (discussed below).