Do neurotransmitters, hormones, or enzymes lead from the visual system to suprachiasmatic nucleus, to control circadian rhythm with and without light?

All & More Complex,: multiple mechanisms, than anyone understands. The engineering of all living systems is largely the most complex engineering known to mankind. Living systems create order out of disorder, the exception to the thermodynamics idea that randomness in the universe only ↑es. While humans have collectively made progress in understanding, it is partial & rarely quantitative, only qualitative understanding