Without these enzymes, the zebrafish is unable to react to light stimulus as the information is stopped in photoreceptors and fails to initiate the transmission of visual information into the brain through the optic nerve. (sciencedaily.com)
If sight or visual perception were no more than an ability to process information about light stimuli, then blindsight subjects could be said to see. (newscientist.com)
However, they note that in one study, a one - hour light stimulus of 10,000 lux (10 times that of the current study) suppressed melatonin by only 39 percent in adults. (sciencedaily.com)