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Encyclopedia > Macula

Image:Human_eye_cross-sectional_view_grayscale.png Human eye cross-sectional view. Courtesy NIH National Eye Institute Human eye cross-sectional view grayscale Copyright: public domain, credit to NIH National Eye Institute requested. ... An eye is an organ that detects light. ... The National Institutes of Health is an institution of the United States government which focuses on medical research. ... The National Eye Institute (NEI) is one of the US National Institutes of Health that was established in 1968. ...

The macula or macula lutea is an oval yellow spot near the center of the retina of the human eye. It has a diameter of about 1.5 mm and is often histologically defined as having two or more layers of ganglion cells. Near its center is the fovea, a small pit that contains the largest concentration of cone cells in the eye and is responsible for central vision. Human eye cross-sectional view. ... An eye is an organ that detects light. ... A millimetre (American spelling: millimeter, symbol mm) is an SI unit of length that is equal to one thousandth of a metre. ... A ganglion cell (or sometimes called a gangliocyte) is a type of neuron located in the retina that receives visual information from photoreceptors via various intermediate cells such as bipolar cells, amacrine cells, and horizontal cells. ... The fovea, a part of the eye, is a spot located in the center of the macula. ... Normalised absorption spectra of human cone (S,M,L) and rod (R) cells Cone cells, or cones, are cells in the retina which only function in relatively bright light. ...

Whereas loss of peripheral vision may go unnoticed for some time, damage to the macula will result in loss of central vision, which is usually immediately obvious. The progressive destruction of the macula is a severe disease known as macular degeneration. Peripheral vision is that part of vision that occurs at the edges of the field of view. ... A disease is any abnormal condition of the body or mind that causes discomfort, dysfunction, or distress to the person affected or those in contact with the person. ... Listen to this article · (info) This audio file was created from the revision dated 2005-07-19, and does not reflect subsequent edits to the article. ...

Sensory system - Visual system

Eye - Optic nerve - Optic chiasm - Optic tract - Lateral geniculate nucleus - Optic radiations - Visual cortex (See also sense) A sensory system is a part of the nervous system that consists of sensory receptors, neural pathways, and those parts of the brain responsible for processing the information. ... The visual system is what allows us to see. ... An eye is an organ that detects light. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... Visual pathway with optic chiasm circled The optic chiasm (from the Greek χλαζειν to mark with an X, after the letter Χ chi) is the part of the brain where the optic nerves partially cross, those parts of the right eye which see things on the right side being connected to the... The optic tract is a part of the visual system in the brain. ... The lateral geniculate nucleus (LGN) of the thalamus is a part of the brain, which is the primary processor of visual information, received from the retina, in the CNS. Schematic diagram of the primate lateral geniculate nucleus. ... Right superior quadrantanopia. ... The visual cortex is the general term applied to both the primary visual cortex (also known as V1) and the visual association area (V2, V3, V4, V5). ...

  Results from FactBites:
Aniridia Network - Fovea/Macula Hypoplasia (0 words)
The macula is a small area on the retina designed for seeing detail, therefore is the area responsable for visual acuity (20/20 etc. vision).
In the middle of the macula is the foveal pit, this is a dip in the retina which is made up entirely of densely packed cone cells and no blood vessels run through this area.
Hypoplasia is a medical term for underdevelopment therefore fovea/macula hypoplasia means underdevelopment of the macula generally or the fovea specificly, there is no clear distinction between the two doctors have their own preference of which term to use.
The Macula (2111 words)
The macula lutea is the small, yellowish central portion of the retina, and it is the area providing the clearest, most distinct vision.
The very center of the macula is called the fovea centralis, an area where all of the photoreceptors are cones; there are no rods in the fovea.
Cystoid macular edema (CME) is a painless disorder affecting the macula.
  More results at FactBites »



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