Macula lutea
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  Macula lutea

Macula lutea

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


One of the two light receiving retinal cells (the other is the rod) that is responsible for daylight vision (e.g., color vision, high visual acuity, bright light vision). The area of the retina that provides central or reading vision, known as the fovea, contains only cones.

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.


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.

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).

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.

A discolored, flat spot of skin.


Mucus plug
A collection of mucus, often tinged with blood, that blocks the cervix during pregnancy; known as the "bloody show" when discharged prior to labor. The texture and amount of mucus discharged varies greatly from woman to woman.

Multiple birth
More than 1 baby delivered.

Multiple gestation
The term to used to describe more than one fetus in the womb, as in the case of twins, triplets, or other higher order multiples. With the use of fertility drugs, multiples have become more common.

Magnocellular layer
2 deep layers of the Lateral Geniculate Nucleus. Large neurons, termination sight of parasol ganglion cells.

M cones
Medium wavelength sensitive cones (green). Are most sensitive to a wavelength of approximately 531nm. (See also L Cones and S Cones).

Macula lutea

Magnocellular pathway
Pathway that begins with the parasol (magno) ganglion cells in the retina and terminates within the magnocellular layer of the LGN. Has a high contrast gain than Parvocellular

Black pigment in the pigment epithelium cells that absorbs light not captured by the retina preventing it from being reflected off the back of the eye.

Membranous discs
Located in outer segments of photoreceptors.

Intensities of light under which both rods and cones operate. See also Photopic and Scotopic

Metameric stimuli
Two stimuli which despite their physical differences are perceptually indistinguishable.

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