Psychology & Psychiatry

Psychology: What gazes reveal about us

A new study by the TU Dresden shows that eye movements during the processing of tasks provide information about what the respective person is currently occupied with and what goals are being pursued within the task. These ...

Autism spectrum disorders

Why eye contact is rare among people with autism

A hallmark of autism spectrum disorder, ASD, is the reluctance to make eye contact with others in natural conditions. Although eye contact is a critically important part of everyday interactions, scientists have been limited ...

Medications

Scientists say eye-disease drug may also help fight COVID

An interdisciplinary research team led by UCLA found that a drug already approved by the Food and Drug Administration for eye disease, verteporfin, stopped the replication of SARS-CoV-2, the virus that causes COVID-19. Their ...

Ophthalmology

Aging eyesight issues and treatment

Diminishing eyesight is a common issue that occurs with age. While often unavoidable, routine eye checks are crucial.

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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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