fovea centralis meaning
Noun: fovea centralis
- Area consisting of a small depression in the retina containing cones and where vision is most acute
Part of: retina
Encyclopedia: Fovea centralis
An area approximately 1.5 millimeters in diameter within the macula lutea where the retina thins out greatly because of the oblique shifting of all layers except the pigment epithelium layer. It includes the sloping walls of the fovea (clivus) and contains a few rods in its periphery. In its center (foveola) are the cones most adapted to yield high visual acuity,each cone being connected to only one ganglion cell. (Cline et al.,Dictionary of Visual Science,4th ed) n : FOVEA 2
- In the fovea centralis or macula lutea or simple yellow spot, cones predominate and are present at high density.
- Frontal-eyed animals have a small area of the retina with very high visual acuity, the fovea centralis.
- There are two to three rods per cone in the fovea centralis but five to six near the optic papilla.
- It is analogous to the way most primates move their eyes to focus images of interest onto the " fovea centralis ".
- 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.