fovea centralis การใช้

• Frontal-eyed animals have a small area of the retina with very high visual acuity, the fovea centralis.
• In the fovea centralis or macula lutea or simple yellow spot, cones predominate and are present at high density.
• 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.
• The eyes of birds, he notes, have a double set of fovea centralis, those depressions in the center of the retina where the focus of the eye is most acute.
• 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.
• An issue that K黨ne encountered when attempting to produce an image from a human eye is that the size of the fovea centralis, the actual focal point of the image on the retina, is very small ( about 1.5 millimetres ).