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Parafovea or the parafoveal belt is a region in the retina that circumscribes the fovea and is part of the macula lutea. [1] It is circumscribed by the perifovea . Photograph of the retina of the human eye, with overlay diagrams showing the positions and sizes of the macula, fovea, and optic disc
The macula (/ˈmakjʊlə/) [1] or macula lutea is an oval-shaped pigmented area in the center of the retina of the human eye and in other animals. The macula in humans has a diameter of around 5.5 mm (0.22 in) and is subdivided into the umbo, foveola, foveal avascular zone, fovea, parafovea, and perifovea areas.
Dog: Dogs are dichromat and less sensitive to differences in grey shades than humans and also can detect brightness at about half the accuracy of humans. [2] The frequency range of dog hearing is approximately 40 Hz to 60,000 Hz, which means that dogs can detect sounds far beyond the upper limit of the human auditory spectrum. [3] n/a
The parafovea has an outer diameter of 2.5 mm representing 8° of the visual field. [ 11 ] [ 12 ] The macula , the next larger region of the retina, is defined as having at least two layers of ganglia (bundles of nerves and neurons) and is sometimes taken as defining the boundaries of central vs. peripheral vision [ 13 ] [ 14 ] [ 15 ] (but this ...
The fovea centralis 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. [1] [2]The fovea is responsible for sharp central vision (also called foveal vision), which is necessary in humans for activities for which visual detail is of primary importance, such as reading and driving.
The typical dog's nose is 100,000 to 1 million times as sensitive as a human's, and the most sensitive breed, the bloodhound, has a sense of smell which can be up to 100 million times as sensitive. Additionally, dogs have much larger olfactory mucosa and a larger part of the brain dedicated to odors.
This list of dog diseases is a selection of diseases and other conditions found in the dog. Some of these diseases are unique to dogs or closely related species, while others are found in other animals, including humans.
Greg Rasmussen (born 30 April 1956) is a 2023 Indianapolis Prize nominee and wildlife conservation biologist who has studied the critically endangered painted dog, previously known as the African wild dog, for over thirty years, one of the longest studies of the species ever conducted.
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