Ophthalmology

Detecting glaucoma early

Glaucoma is a group of eye diseases wherein increased pressure within the eye can, if left untreated, lead to damage to the optic nerve and vision loss. Its detection relies on measuring intraocular pressure, visual examination ...

Ophthalmology

Five steps to protect young athletes' eyes

(HealthDay)—As children begin to return to their favorite sports, parents need to ensure that their youngsters use protective eyewear, a leading group of eye specialists says.

Psychology & Psychiatry

Our attention is captured by eye-glance

Eyes play an important role in social communication by expressing the intentions of our interlocutors, and even more so in times of pandemic when half of the face is hidden. But is this eye contact automatic and rapid? Is ...

Neuroscience

The auditory system tracks moving sounds

The brain's auditory system tracks the speed and location of moving sounds in the same way the visual system tracks moving objects. The study recently published in eNeuro lays the groundwork for more detailed research on ...

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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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