A signal processing method performed by a processor of an ophthalmic device including a step of obtaining an interference signal between measurement light and reference light, a step of obtaining a peak value component determined by a distribution of brightness in the interference signal, a step of obtaining a corrected interference signal by subtracting a signal of magnitude determined from the peak value component from the interference signal, a step of employing the corrected interference signal as the interference signal, and repeatedly executing the step of obtaining the peak value component for the interference signal and the step of obtaining the corrected interference signal until the subtraction result corrected interference signal is a predetermined threshold or lower, and a step of obtaining OCT data based on the corrected interference signal of the threshold or lower.