Lutea

February 14, 2012 501 No of hits
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Lutea

In order for sight to occur, the lens of the eye focuses light on the retina at the back of the eye. The part of the eye responsible for detailed central vision (also called "visual acuity") is the macula, also called the macula lutea. This yellow, oval-shaped area in the center of the retina is in a direct line with the object being viewed and the lens of the eye. (In Latin, the word "macula" means "spot" and "lutea" means "yellow.") The macula is located near the optic nerve, which allows it to easily send the information that it collects to be interpreted by the brain.

At the center of the macula lies the fovea, the highly sensitive part of the eye that is responsible for the most detailed central vision possible. The fovea contains no blood vessels, and its clarity is therefore clearer than the rest of the macula. Of the two types of photoreceptors, the fovea contains only rods (which see color) and not cones (which see movement and dim objects), and these rods are usually spaced extremely densely for optimum vision.

The yellow color of the macula absorbs blue and ultraviolet light that enters the eye. This causes it to act analogous to sunblock for the retina, protecting the structure to some degree.

Macular degeneration is a common ailment of people over the age of fifty. Dry macular degeneration occurs when the eye ages, and cells in the macula lutea begin to die (the cause of the cell death is unclear). Wet macular degeneration occurs when fragile blood vessels under the retina break and leak onto the macula, blurring vision. Both types of macular degeneration can be treated, but treatment only prevents addition vision loss; it does not restore any vision that has been previously harmed.

Tags:   Lutea   Macula   Macula lutea   Retina   Macular degeneration  

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Lutea
Lutea
Created on : November 06, 2012

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In order for sight to occur, the lens of the eye focuses light on the retina at the back of the eye. The part of the eye responsible for detailed central vision (also called "visual acuity") is the macula, also called the macula lutea. This yellow, oval-shaped area in the center of the retina is in...

By: Richard Martine Created 75 months ago

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