News tagged with eye

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

This Fourth of July, leave fireworks to professionals

Thousands of accidents each year underscore the danger of fireworks. In 2014, 11 people died and an estimated 10,500 were treated in emergency departments for fireworks-related injuries in the U.S. Statistics show the typical ...

Jun 30, 2016
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Stable perception in the adult brain

The adult brain has learned to calculate an image of its environment from sensory information. If the input signals change, however, even the adult brain is able to adapt − and, ideally, to return to its original activity ...

Jun 10, 2016
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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.

This text uses material from Wikipedia, licensed under CC BY-SA

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