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| This glossary contains: 19186 medical terms |
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Emmetropia
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Emmetropia An eye whose image is focused on the retina, rather than in front of behind it. (As opposed to Hyperopia and Myopia).
RELATED TERMS--------------------------------------
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.
Hyperopia
Hyperopia (or more rarely, hypermetropia), also known as farsightedness or longsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short), causing inability to focus on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves towards the eye, the eye must increase its power to keep the image on the retina.
SIMILAR TERMS--------------------------------------
Emmert's Law
A monocular after-image is located on any surface to which a subject fixates while the after -image is present.x The perceived size of the after-image increases as the perceived distance of the surface increase. Shows that monocular cues may be insufficient to estimate an object's length.
PREVIOUS AND NEXT TERMS--------------------------------------
Edge integration
Describes a model of lightness perception in which a region's lightness is computed by integrating over the contrast edges in an image.
Efferent
Heading away. A system's efferent signals are those exiting to elsewhere. (As opposed to Afferent)
Ehrenstein illusion
A series of radial lines create an illusory circle that appears to be brighter than the background.
Eigengrau
German word for 'intrinsic gray'. When both entire retinal images are stabilized, the observer does not perceive black but a non-descript gray fog.
Emmert's Law
A monocular after-image is located on any surface to which a subject fixates while the after -image is present.x The perceived size of the after-image increases as the perceived distance of the surface increase. Shows that monocular cues may be insufficient to estimate an object's length.
Emmetropia
End-Inhibition
A property of some cells in the visual cortex which respond strongly to either an edge, a bar or a slit which ends within the receptive field.
End-Stopped cell
An orientation selective cell which is also sensitive to the end of a line or edge, responding to short but not long lines or edge stimuli.
Epicapsular stars
Remnants left on the eye of the hyaloid canal, from development in the womb.
Epipolar line
For a given point in space, this is the line on which the point will fall in the opposite eye. This line is tilted out of the horizontal unless the eyes are fixated on a very distant object.
Equiluminant stimuli
Visual stimuli that vary only in color but not in luminance. Stereopsis and motion perception disappear at equiluminance indicating the presence of separate processing channels for color, motion and stereopsis.
RELATED TERMS--------------------------------------
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.
Hyperopia
Hyperopia (or more rarely, hypermetropia), also known as farsightedness or longsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short), causing inability to focus on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves towards the eye, the eye must increase its power to keep the image on the retina.
SIMILAR TERMS--------------------------------------
Emmert's Law
A monocular after-image is located on any surface to which a subject fixates while the after -image is present.x The perceived size of the after-image increases as the perceived distance of the surface increase. Shows that monocular cues may be insufficient to estimate an object's length.
PREVIOUS AND NEXT TERMS--------------------------------------
Edge integration
Describes a model of lightness perception in which a region's lightness is computed by integrating over the contrast edges in an image.
Efferent
Heading away. A system's efferent signals are those exiting to elsewhere. (As opposed to Afferent)
Ehrenstein illusion
A series of radial lines create an illusory circle that appears to be brighter than the background.
Eigengrau
German word for 'intrinsic gray'. When both entire retinal images are stabilized, the observer does not perceive black but a non-descript gray fog.
Emmert's Law
A monocular after-image is located on any surface to which a subject fixates while the after -image is present.x The perceived size of the after-image increases as the perceived distance of the surface increase. Shows that monocular cues may be insufficient to estimate an object's length.
Emmetropia
End-Inhibition
A property of some cells in the visual cortex which respond strongly to either an edge, a bar or a slit which ends within the receptive field.
End-Stopped cell
An orientation selective cell which is also sensitive to the end of a line or edge, responding to short but not long lines or edge stimuli.
Epicapsular stars
Remnants left on the eye of the hyaloid canal, from development in the womb.
Epipolar line
For a given point in space, this is the line on which the point will fall in the opposite eye. This line is tilted out of the horizontal unless the eyes are fixated on a very distant object.
Equiluminant stimuli
Visual stimuli that vary only in color but not in luminance. Stereopsis and motion perception disappear at equiluminance indicating the presence of separate processing channels for color, motion and stereopsis.
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This dictionary contains 19186 terms.
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