Multiband afterglow light curve of GRB 220107A. Red points show the Swift/XRT flux density at 2 keV (right-hand axis, apparent magnitude scale at far right), and orange points show contemporaneous UVOT white-band detections (scaled as indicated in the legend). Colored circles represent ground-based optical photometry from MITSuME Akeno, Nanshan/NEXT, SAO RAS Zeiss-1000, AbAO AS-32, Terskol K-800, and other facilities (individual filter scalings are noted in the legend to improve visibility). Solid lines are single power-law fits to the X-ray (red) and R-band optical (green) data, and the surrounding shaded regions show the 1σ uncertainty bands from the fit. The X-ray and optical light curves are well described by simple power-law decays with indices α_X = 1.48 ± 0.04 and α_O = 1.52 ± 0.09, respectively, indicating an achromatic decline. The figure demonstrates the broadband temporal behavior of the afterglow and the agreement between X-ray and optical decay slopes, which we use to constrain the circumburst environment and emission regime.