A research study published in Frontiers in Human Neuroscience revealed more about the eye-brain connection. Fifty subjects viewed optical illusions that evoked the perception of an expanding black hole, as compared to those that appeared in a previous study as an increase in brightness and tracked pupillary responses.
(Front. Hum. Neurosci., 30 May 2022 Sec.Sensory Neuroscience, https://doi.org/10.3389/fnhum.2022.877249)