News tagged with eye

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

The eyes are the window into the brain

Our eyes are constantly moving, whether we notice or not. They jump from one focus point to another and even when we seem to be focused on one point, the eyes continue to reflexively move. These types of eye movements are ...

Jul 27, 2016
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Dry eye is common and easily treated

Our eyes can become dry and uncomfortable due to a number of things - irritants in the environment, age, gender, certain medications or medical conditions - that can leave them feeling gritty, burning, itchy, and often feeling ...

Jul 18, 2016
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Xiidra eyedrops approved to treat dry eye

(HealthDay)—Xiidra (lifitegrast) eyedrops have been approved by the U.S. Food and Drug Administration to treat symptoms of dry eye disease, a group of conditions related to insufficient tear production.

Jul 12, 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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