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

New imaging method makes tiny robots visible in the body

Microrobots have the potential to revolutionize medicine. Researchers at the Max Planck ETH Centre for Learning Systems have now developed an imaging technique that for the first time recognizes cell-sized microrobots individually ...

Researchers create flat magic window with liquid crystals

For the first time, researchers have used liquid crystals to create a flat magic window—a transparent device that produces a hidden image when light shines on it. The technology represents a new twist on a very old light ...

Microplastics in the Cauvery River may be harming fish

Pollutants like microplastics may be causing growth defects in fish, including skeletal deformities, in the Cauvery River, a new study reveals. Published in the journal Ecotoxicology and Environmental Safety, the study was ...

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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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