Macula
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  Macula



Macula

    A specialized part of the retina containing mostly cones. The macula is used for all detailed visual tasks. The center of the macula is called the fovea. If a disease process harms or destroys the macula, vision is usually reduced to 20/200 (legal blindness).

RELATED TERMS
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Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.

Macula
A specialized part of the retina containing mostly cones. The macula is used for all detailed visual tasks. The center of the macula is called the fovea. If a disease process harms or destroys the macula, vision is usually reduced to 20/200 (legal blindness).

Fovea
A central portion of the retina and macula that contains only cones. The fovea is the only part of the eye that is capable of 20/20 or better vision.

Disease
Illness or sickness often characterized by typical patient problems (symptoms) and physical findings (signs). Disruption sequence: The events that occur when a fetus that is developing normally is subjected to a destructive agent such as the rubella (German measles) virus.

Vision
The sense of sight.



SIMILAR TERMS
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Macugen
Macugen is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): pegaptanib sodium.

Macula lutea
The cone rich area of the human eye that contains the fovea.

Macular degeneration
Damage or breakdown of the macula, which is an area in the back of the eye that controls central vision. It may be caused by injury or aging; and while it does not progress to total blindness, patients with macular degeneration require special optical aids to enlarge distant and near objects.

Macular Edema
A swelling (edema) in the macula, an area near the center of the retina of the eye that is responsible for fine or reading vision. Macular edema is a common complication associated with diabetic retinopathy.|See also: Diabetic retinopathy; retina.

Macule
A discolored, flat spot of skin.



PREVIOUS AND NEXT TERMS
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Mephobarbital
An anticonvulsant medication.

Mianserin
An antidepressant substance.

Metharbital
An anticonvulsant.

Medazepam
A tranquilizer.

Maprotyline
An antidepressant.

Macula

Microphthalmus
A congenital problem in which the eye(s) is (are) smaller than normal. Vision is often reduced because other problems present within such an eye. No treatment is available.

Mydriatic
A drug that dilates the pupil (see cycloplegia). Sometimes used to treat amblyopia, particularly if the child will not wear an eye patch over the stronger eye.

Mayo Clinic
The Mayo Clinic is a world-renowned medical practice operated by the Mayo Foundation, a not-for-profit organization based in Rochester, Minnesota. The first and largest facilities of the Mayo Clinic are also located in Rochester, but it also runs additional hospitals in Jacksonville, Florida and Scottsdale, Arizona. In addition, the Mayo Foundation operates a number of smaller clinics and hospitals in Minnesota, Iowa, and Wisconsin.

Mayo Clinic diet
A nutritional diet developed by the prestigious Mayo Clinic.

Mammography
An X-ray procedure using a special low irradiation technique to detect abnormal change in breast tissue. Its main use is to detect breast lumps that are too small to be found during breast self examination or physical examination. The higher the level of estrogen (and possibly progestin) the more dense breast tissue is and the less likely that a mammogram will see abnormal tissue. It has many false positive readings meaning that there is no cancer yet the test was abnormal.

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