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What is a macula?

What is a macula? Here are some definitions.

Noun
  1. (anatomy) An oval yellow spot near the center of the retina of the human eye, histologically defined as having two or more layers of ganglion cells, responsible for detailed central vision.
  2. A spot, as on the skin, or on the surface of the sun or of some other luminous orb.
  3. A rather large spot or blotch of color.
  4. In planetary geology, an unusually dark area on the surface of a planet or moon.
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Examples
Fuchs' spot describes a round or elliptic elevated dark brown lesion located in the macula that arises because of choroidal neovascularization.
Degeneration of the macula causes blurred central vision or a blind spot in the center of your visual field.
With the head erect, the macula in each utricle is oriented horizontally, and in the saccule vertically.
The focus is on a 3-millimeter-wide yellow spot, called the macula lutea, toward the back and center of the eye.
To evaluate an effective functional strategy for detecting glaucomatous damage of the macula in preperimetric to perimetric glaucoma.
Fundal examination showed a large choroidal rupture of the left macula.

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