Health

Screen time can seriously harm your eyes: Here's how to avoid it

Every day, more and more patients are seeking medical attention after spending long days in front of computer screens. The most common symptoms include irritated or itchy eyes, and a sensation of dryness or sand on the surface ...

Medications

FDA warns of dangerous counterfeit eyedrops

Certain copycat eyedrops may be contaminated and could give users an antibiotic-resistant eye infection, the U.S. Food and Drug Administration warned Wednesday.

Biomedical technology

Researchers use the eye as a window to study liver health

Researchers at Karolinska Institutet have developed a method to study liver function and disease without requiring invasive procedures. After transplanting liver cells into the eye of mice, the cornea can be used as a window ...

Health

Shedding light on driving in the dark

Driving at night might present more hazards than daytime driving. Nighttime blurriness is common, and bright headlights often lead to glares, halos around headlights and starbursts, which makes vision extremely challenging. ...

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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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