Fovea are the layers of the retina spread aside to let light fall directly on the cones, the cells that give the sharpest image.
Since the fovea does not have rods, it is not sensitive to dim lights. Hence, in order to observe dim stars, astronomers use averted vision, looking out of the side of their eyes where the density of rods is greater, and hence dim objects are more easily visible. The diagram shows the relative acuity of the left human eye (horizontal section) in degrees from the fovea. Fovea (or Fovea centralis) is the depression in the inner retinal surface, about 1.5 mm wide, the photoreceptor layer of which is entirely cones and which is specialized for maximum visual acuity. fovea centralis [BACK TO TOP]. Meaning: Area consisting of a small depression in the retina containing cones and where vision is most acute. Classified under: Nouns denoting body parts. Synonyms: fovea; fovea centralis. Hypernyms (fovea centralis is a kind of...): • FOVEA (noun). The noun FOVEA has 1 sense: 1. area consisting of a small depression in the retina containing cones and where vision is most acute. Familiarity information: FOVEA used as a noun is very rare.  In the middle of the retina is a small dimple called the fovea or fovea centralis. It is the center of the eye's sharpest vision and the location of most color perception.  The fovea centralis (the term fovea comes from the Latin, meaning pit or pitfall) is a small, central pit composed of closely packed cones in the eye. It is located in the center of the macula lutea of the retina. The diagram shows the relative acuity of the left human eye (horizontal section) in degrees from the fovea. Fovea (or Fovea centralis) is the depression in the inner retinal surface, about 1.5 mm wide, the photoreceptor layer of which is entirely cones and which is specialized for maximum visual acuity. The parafovea extends to a radius of 1.25 mm from the central fovea, and the perifovea is found at a 2.75 mm radius from the fovea centralis. The diagram shows the relative acuity of the left human eye (horizontal section) in degrees from the fovea. Fovea (or Fovea centralis) is the depression in the inner retinal surface, about 1.5 mm wide, the photoreceptor layer of which is entirely cones and which is specialized for maximum visual acuity. fovea centralis. A small area of the retina of approximately 1.5 mm in diameter situated within the macula lutea. At the fovea centralis, the retina is the thinnest as there are no supporting fibres of Mueller, no ganglion cells and no bipolar cells. These cells are shifted to the edge of the depression • FOVEA CENTRALIS (noun). The noun FOVEA CENTRALIS has 1 sense: 1. area consisting of a small depression in the retina containing cones and where vision is most acute. Familiarity information: FOVEA CENTRALIS used as a noun is very rare. Meaning: Area consisting of a small depression in the retina containing cones and where vision is most acute. Classified under: Nouns denoting body parts. Synonyms: fovea; fovea centralis. Hypernyms (fovea centralis is a kind of...): Fovea: In the eye, a tiny pit located in the macula of the retina that provides the clearest vision of all. Only in the fovea are the layers of the retina spread aside to let light fall directly on the cones, the cells that give the sharpest image. Also called the central fovea or fovea centralis. The word fovea is the Latin word for small pit.. The fovea is literally a small depression (in the retina)
https://en.wikipedia.org/wiki/Fovea_centralis http://www.audioenglish.org/dictionary/fovea_centralis.htm http://www.audioenglish.org/dictionary/fovea.htm http://hyperphysics.phy-astr.gsu.edu/hbase/vision/retina.html https://en.wikipedia.org/wiki/Fovea_centralis https://en.wikipedia.org/wiki/Fovea_centralis http://medical-dictionary.thefreedictionary.com/fovea+centralis http://www.audioenglish.org/dictionary/fovea_centralis.htm http://www.medicinenet.com/script/main/art.asp?articlekey=24120
what does the fovea do