News tagged with eye

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

Do you know the signs of being too sleepy to drive?

Drivers with tired eyes are three times more likely to cross the centre line, according to QUT research, which has pinpointed four eye symptoms to help drivers recognise the signs they are too sleepy to get behind the wheel.

Sep 15, 2015
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A rare condition of excruciating eye pain

Razor blades. Jabbing needles. Barbed wire. Screaming, howling, red-hot-poker-in-the-eye pain. The impulse to gouge your own eyes out or overdose on sleeping pills – anything to make the pain go away.

Sep 08, 2015
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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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