News tagged with eye

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

The invisible world of human perception

Stage magicians are not the only ones who can distract the eye: a new cognitive psychology experiment demonstrates how all human beings have a built-in ability to stop paying attention to objects that are right in front of ...

Mar 21, 2016
popularity19 comments 0

New treatment for common incurable eye condition

Patient-reported results of a novel treatment for pterygium and pinguecula, a common incurable eye condition presented at ARVO's Israel Chapter national meeting. The treatment utilizes the well-known cardiovascular drug ...

Mar 15, 2016
popularity26 comments 0

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

Subscribe to rss feed