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| This glossary contains: 19186 medical terms |
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CPD
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CPD Cycles per degree of visual angle. The human limit is about 30cpd in the fovea for an individual with 20/20 vision.
RELATED TERMS--------------------------------------
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.
Vision
The sense of sight.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Contrast sensitivity function
The reciprocal of the threshold contrast required to obtain a criterion response from a cell or a human subject as a function of spatial frequency. Falls off in sensitivity as the spatial frequency of the test pattern increases.
Coplanar ratio hyphothesis
An hypothesis by Gilchrist in which the visual system does not use retinal contrasts to determine relative lightnesses but uses depth information to determine which regions are at the same depth (coplanar) and uses their contrasts to deteremine the lightness perceived. This hypothesis has come under recent attack.
Correspondence problem
In Stereopsis: the challenge of matching elements in one eye with elements in another eye. Also known as the Matching Problem. In Motion: the challenge of matching moving elements in one frame with elements in a succeeding frame (especially true of random dot cinematograms).
Corticaltectal pathway
Pathway from the cortex to the superior colliculi.
Cortical magnification factor
Defined as millimeters of cortex per degree of visual angle.
CPD
Critical flicker frequency (CFF)
The frequency of flicker where the alternating levels of brightness are seen as a single level. The frequency is dependent on brightness levels and retinal location.
Cytochrome oxidase
Histochemical method. Indicator of functional state of neurons as brain derives energy from oxidase metabolism. Used in the discovery of blobs in the visual cortex.
Caseous
Having a consistency like that of cottage cheese.
Catarrh
Inflammation of a mucous membrane with free discharge.
Cholelith
Gallstone; bile stone.
RELATED TERMS--------------------------------------
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.
Vision
The sense of sight.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Contrast sensitivity function
The reciprocal of the threshold contrast required to obtain a criterion response from a cell or a human subject as a function of spatial frequency. Falls off in sensitivity as the spatial frequency of the test pattern increases.
Coplanar ratio hyphothesis
An hypothesis by Gilchrist in which the visual system does not use retinal contrasts to determine relative lightnesses but uses depth information to determine which regions are at the same depth (coplanar) and uses their contrasts to deteremine the lightness perceived. This hypothesis has come under recent attack.
Correspondence problem
In Stereopsis: the challenge of matching elements in one eye with elements in another eye. Also known as the Matching Problem. In Motion: the challenge of matching moving elements in one frame with elements in a succeeding frame (especially true of random dot cinematograms).
Corticaltectal pathway
Pathway from the cortex to the superior colliculi.
Cortical magnification factor
Defined as millimeters of cortex per degree of visual angle.
CPD
Critical flicker frequency (CFF)
The frequency of flicker where the alternating levels of brightness are seen as a single level. The frequency is dependent on brightness levels and retinal location.
Cytochrome oxidase
Histochemical method. Indicator of functional state of neurons as brain derives energy from oxidase metabolism. Used in the discovery of blobs in the visual cortex.
Caseous
Having a consistency like that of cottage cheese.
Catarrh
Inflammation of a mucous membrane with free discharge.
Cholelith
Gallstone; bile stone.
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This dictionary contains 19186 terms.
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