Visual inputs to the what serve to synchronize biorhythms with natural light and dark?

Visual inputs to the suprachiasmatic nucleus (SCN) located in the brain serve to synchronize our biorhythms with natural light and dark cycles. The SCN is responsible for regulating our circadian rhythms, such as sleep-wake cycles, based on the amount of light received by the eyes, helping to establish our internal body clock. This synchronization helps us maintain proper sleep-wake patterns and other physiological functions in alignment with the external environment.