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The simplest "eyes", such as those in microorganisms , do nothing but detect whether the surroundings are light or dark , which is sufficient for the entrainment of circadian rhythms . [3] From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment and to the pretectal area to control the pupillary light reflex .