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Keyword Suggestionseyes and more
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The simplest "eyes", such as those in microorganisms , 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 and to the pretectal area to control the pupillary light reflex .
The human eye is an organ which reacts to light and pressure. As a sense organ , the mammalian eye allows vision . Human eye helps to provide a three dimensional, moving image, normally coloured in daylight. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can differentiate between about 10 million colors  and is possibly capable of detecting a single photon . 
The human eye has been called the most complex organ in our body. It's amazing that something so small can have so many working parts. But when you consider how difficult the task of providing vision really is, perhaps it's no wonder after all.
With Eyefi Mobi desktop you can send your JPEG and RAW files from your camera directly to your PC or Mac so you can add your personal touch with tools like Adobe Lightroom and save them with your computer-stored collections.
Eye has a global distribution and supports medical professionals in the delivery of excellent ophthalmic services and healthcare. Its core aim is to advance the science and practice of ophthalmology, with the latest clinical and scientific based research and studies. Eye welcomes manuscripts from the international ophthalmic community; it is produced by the Royal College of Ophthalmologists, the professional body for ophthalmologists, and promoted on its website: www.rcophth.ac.uk .