News tagged with eye

Related topics: brain , nerve cells , current biology , retina

Carnival game mimics eye growth

The motion of coins in a "Penny Pusher" carnival game is similar to the movement of cells in the eye's lens, as described in a new study published in Investigative Ophthalmology & Visual Science (IOVS). This new insight m ...

Mar 26, 2015
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Many things can be read in a newborn's gaze

Experienced nannies and doctors have always known how much the visual contact with a newborn can convey. A recent Finnish study provides scientific evidence for this everyday belief. A study performed in ...

Mar 24, 2015
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Eye

Eyes are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain[citation needed]. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, molluscs, chordates, annelids and arthropods.

The simplest "eyes", such as those in unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.

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