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Lightness
Lightness The perception of reflectance. Related to the perception of an object's surface.
RELATED TERMS--------------------------------------
Reflectance
The fraction of incident light that is reflected toward the eye by an object.
SIMILAR TERMS--------------------------------------
Light chain
The light chain of immunoglobulin is a structural feature that occurs in two forms: kappa and lambda.
Lightening
When the fetus descends into the pelvic cavity. In first-time mothers, usually occurs two to four weeks before delivery; women who have already givenbirth usually don't lighten until they begin labor.
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Low birth weight
When a full-term infant weighs less than 5.5 pounds at birth. Nearly seven of every 100 newborns are low birthweight babies; most of these cases are linked to cigarette, alcohol, or drug use during pregnancy and can be prevented.
Lumbar puncture
A procedure in which spinal fluid is drawn from the spinal column to check for diseases, including meningitis.
L cones
Long wavelength sensitive cones (red). Are most sensitive to a wavelength of approximately 558nm. (See also M Cones and S Cones).
Lateral geniculate nucleus
Structure located in the thalamus which is a major recipient of axons from the retina. About 10% of its input is from the retina. It is composed of 6 layers. While input to the LGN from the two eyes is segregated, significant binocular influence can be exerted on the LGN by the cortex.
Left visual hemifield
The left half of the visual field, projects on the nasal hemiretina of the left eye and on the temporal hemiretina of he right eye.
Lightness
Linespread
The distribution of how the image of a very thin line is blurred on the retina (due to diffraction). Depends on pupil size.
LGN
See Lateral Geniculate Nucleus.
Lethal acrodermatitis
An inherited autosomal recessive disease in bull terriers relating to zinc metabolism.
Lymphangitis
Inflammation of a lymph vessel.
Lipidemia
Excess lipid in the blood.
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