yellow spot

noun
Ophthalmology, macula ( def 2b ).

Origin:
1865–70

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Collins
World English Dictionary
yellow spot
 
n
anatomy another name for macula lutea

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

yellow spot n.
See macula lutea.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

yellow spot

in anatomy, the small yellowish area of the retina near the optic disk that provides central vision. When the gaze is fixed on any object, the centre of the macula, the centre of the lens, and the object are in a straight line. In the centre of the macula is a depression, called the fovea, which contains specialized nerve cells that are exclusively of the type known as cones. Cones are associated with colour vision and perception of fine detail. Toward the centre of the macula there are no blood vessels to interfere with vision; thus, in this area, vision in bright light and colour perception are keenest.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Some, but not all, tundras have a yellow spot at the base of the bill near the
  eye.
The head has a large yellowish crescent or blotch behind the eyes and a
  distinct yellow spot under the eye on the lower jaw.
The first segment has a large brownish yellow spot also positioned laterally
  and proximally.
The perianth is pale blue with a yellow spot in the center.
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