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Research over the past decade has shown that the rods and cones are not the only photoreceptors of the eye. There also exists a population of directly light sensitive ganglion cells that act as brightness detectors and regulate a wide variety of different photosensory tasks, including the regulation of 24-h circadian clocks, synthesis of the hormone melatonin, pupil size and behaviour. These receptors may even help modulate our mood and sense of well-being.


Journal article


J Neuroendocrinol

Publication Date





179 - 180


Animals, Circadian Rhythm, Humans, Light, Photic Stimulation, Photoreceptor Cells, Retina, Retinal Ganglion Cells, Visual Perception