from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small cuplike depression or pit in a bone or organ.
- n. The fovea centralis.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A slight depression or pit in a bone or organ.
- n. The retinal fovea, or fovea centralis, responsible for sharp central vision.
from the GNU version of the Collaborative International Dictionary of English
- n. A slight depression or pit; a fossa.
from The Century Dictionary and Cyclopedia
- n. In anatomy and zoology, a depression or shallow pit in a surface, generally more or less rounded.
- n. In botany, a depression or pit; especially, a depression on the upper surface of the leaf-sheath in Isoetes, in which the sporangium is formed.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. area consisting of a small depression in the retina containing cones and where vision is most acute
For one, the eye takes in a limited amount of high-quality information through a part of the eye called the fovea, which is supplemented with lower-quality info as needed.
The central part of the retina where our vision is focused most is called the fovea.
When you look at a close object, you have to turn in your two eyes so that the image that you're looking at falls on the central part of the retina, called the fovea, of the two eyes.
Most birds, like most mammals, have a single area within the eye of perfect vision, called the fovea, where cone cells, which detect sharp contrast and detail, are most concentrated.
The fovea is a cute trick to squeeze greater acuity out of a flawed design, but octopi and squid do it better.
This part of the retina is called fovea centralis.
Furthermore, in the very center of the macula lutea there is - a small depression called the fovea centralis (foh'vee-uh sen-tray'lis; "central pit" L) which is right where light focuses.
"The density of light-receptor cells decreases progressively from the center of the retina-known as the fovea-to the edges of the retina …."
When I was a psychology graduate student, it was already well known that the density of light-receptor cells decreases progressively from the center of the retina-known as the fovea-to the edges of the retina, as shown in Figure 2.
Here's a graph of the distribution -- the fovea is the center of your vision, where it's in perfect focus.
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