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A small depression near the center of the retina, constituting the area of most acute vision.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
A small area of the retina of approximately 1.5 mm in diameter situated within the macula lutea. At the fovea centralis, the retina is the thinnest as there are no supporting fibres of Mueller, no ganglion cells and no bipolar cells. These cells are shifted to the edge of the depression. The fovea centralis contains mainly cone cells, each one being connected to only one ganglion cell and thus contributing to the highest visual acuity of the retina. The visual field represented by the fovea centralis is equal to about 5º (Fig. F9). Syn. foveal pit; macula (term often used by clinicians). See central visual acuity; retinal image; macula lutea.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann