retina

Definitions

  • WordNet 3.6
    • n retina the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
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Webster's Revised Unabridged Dictionary
  • Interesting fact: You blink every 2-10 seconds. As you focus on each word in this sentence, your eyes swing back and forth 100 times a second, and every second; the retina performs 10 billion computer-like calculations.
    • n Retina (Anat) The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See Eye.☞ The fibers of the optic nerve and the retinal blood vessels spread out upon the front surface of the retina, while the sensory layer (called Jacob's membrane), containing the rods and cones, is on the back side, next the choroid coat.
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Century Dictionary and Cyclopedia
  • Interesting fact: The dragonfly has about 30,000 lenses covering the retina of its eye, and thus sees many, many images where we see only one.
    • n retina The innermost and chiefly nervous coat of the posterior part of the eyeball, between the choroid coat and the vitreous humor. It extends from the entrance into the eyeball of the optic nerve toward the crystalline lens, terminating in the ora serrata. A modified division of the retinal structure is, however, continued forward as the pars ciliaris retinæ. The retina consists of a delicate and complex expansion and modification of the optic nerve, supported by a network of connective tissue. It may be divided into ten layers: internally, next the hyaloid membrane of the vitreous humor, the internal limiting membrane, formed of the expanded bases of the fibers of Muller; the fibers of the optic nerve; layer of ganglion-cells; internal molecular or granular layer; inner nuclear layer: external molecular or granular layer: external nuclear layer; external limiting membrane, which is connected with the ends of Muller's fibers; layer of rods and cones, or bacillary layer; (10) pigmentary layer. In the center of the back part of the retina, near the line of the optic axis, is the macula lutea, the most sensitive part of the retina; and in the center of the macula is a depression, the fovea centralis, in which the rods are absent. The color of the macula is due to a yellow pigment. About one tenth of an inch internally to the fovea is the point of entrance of the optic nerve with its central artery; the retina is incomplete at this point, and constitutes the “blind spot.” The nerve-fibers have been estimated to number 400,000 broad and as many narrow fibers, and for each fiber there are 7 cones, 100 rods, and 7 pigment-cells. The retina serves the purpose of vision in being the organ through or by means of which vibrations of luminiferous ether excite the optic nerve to its appropriate activity. See eye.
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Chambers's Twentieth Century Dictionary
    • n Retina ret′i-na the innermost coating of the eye, consisting of a fine network of optic nerves
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Etymology

Webster's Revised Unabridged Dictionary
NL., from L. rete, a net. Cf. Reticule
Chambers's Twentieth Century Dictionary
Fr.,—L. rete, a net.

Usage

In literature:

Each is individually too small to excite our retina, but as a whole, curiously enough, they are perfectly visible.
"Astronomy for Amateurs" by Camille Flammarion
If I could only succeed in making an impression on the retina of Aunt Celia's eye!
"A Cathedral Courtship" by Kate Douglas Wiggin
The arteries of the retina have been observed to dilate after very small doses of alcohol.
"Alcohol: A Dangerous and Unnecessary Medicine, How and Why" by Martha M. Allen
Every point in the retina is evenly excited, and the local signs of all are simultaneously felt.
"The Sense of Beauty" by George Santayana
As a result, the image in the mind of the dying person is returned to the retina.
"The Eyes Have It" by Gordon Randall Garrett
Her tone of conviction gave me a strong impression what she was looking like, and made an image of her flash across my retina.
"When Ghost Meets Ghost" by William Frend De Morgan
Or did it bear but a haunting resemblance to some other, painted on my memory's retina in lurid, yet partially obliterated, colours?
"The House by the Lock" by C. N. Williamson
The light, coming through the pupil and traversing the vitreous humor, strikes the retina from the inside of the eyeball.
"Psychology" by Robert S. Woodworth
But on my retina was photographed those features, in a pale, illumined circle.
"The Brightener" by C. N. Williamson
But we do not, nor could we, have this idea from the flat image on the retina alone, i.e.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 7" by Various
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In poetry:

Ah, there's more sky in these parts than, say,
ground. Hence her voice's pitch,
and her stare stains your retina like a gray
bulb when you switch
"Belfast Tune" by Joseph Brodsky

In news:

The Retina 's 2,048x1,536-pixel screen is demanding.
Skype just released a new Retina -optimized version of Skype for iPad.
You must have a retina display to see the difference between the images.
For a dramatic comparison, open this page on a retina device and a conventional display simultaneously.
Apple's iPad 3 Could Include Retina Display, Faster Processor, Bigger Battery.
IPad Mini 2 'With Retina Display' on Its Way.
Rumored 13-inch Retina MacBook Pro to sell for $1,699, report says.
MacBook Pro with Retina display could sell for $1,699, according to a report.
Apple marketing chief Phil Schiller unveils the new 13-inch MacBook Pro with Retina laptop Tuesday in San Jose.
13 MacBook Pro with Retina Display.
Content tagged with " Retina Implant AG".
Second Sight and Retina Implant use different technologies to bring eyesight to the blind.
Google is working on a new version of Chrome for use on Apple's retina -display laptops.
Google announced that it is readying its Web browser, Chrome, for Apple's new retina display laptops.
Simply called the iPad, the new tablet replaces the iPad 2 and features a 3.1 million pixel ' retina display'.
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In science:

First, we aim at mimicking as closely as possible the retina for the design of a novel image coder while keeping encouraging performances.
Streaming an image through the eye: The retina seen as a dithered scalable image coder
Second, we bring a new insight concerning the non-deterministic behavior of the retina.
Streaming an image through the eye: The retina seen as a dithered scalable image coder
Then, the retina binarizes the signal obtained to generate a set of uniformly shaped electrical impulses: the spikes .
Streaming an image through the eye: The retina seen as a dithered scalable image coder
In order to design a novel bio-inspired image coder, we need to capture the main properties of the retina processing.
Streaming an image through the eye: The retina seen as a dithered scalable image coder
Besides, the retina appears to be a non-deterministic system.
Streaming an image through the eye: The retina seen as a dithered scalable image coder
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