7 PRIMER (ENTOPTIC PHENOMENON, COLORS) Flashcards
Refers to visual perceptions that are produced or influenced by the structures of one’s own eye.
- Entoptic Imagery (entoptic Phenomenon)
- Color vision
Entoptic Imagery (entoptic Phenomenon)
“produced by the structures of own eye”
opacities of the ocular media
- pathologic imperfections
- physiologic imperfections
pathologic imperfections
Under some conditions colored halos can be seen to surround small white lights that are viewed from a distance
- Physiologic and pathologic halos
- Vitreoretinal sources of entoptic images
Physiologic and pathologic halos
chromatic dispersion of white light by various layers of cells in the ocular media.
- Physiologic and pathologic halos
- Vitreoretinal sources of entoptic images
Physiologic and pathologic halos
radial arrangement of lens fibers, which act as diffraction grating
- Physiologic halos
- Pathologic halos
Physiologic halos
increase IOP, radiation keratopathy
- Physiologic halos
- Pathologic halos
Pathologic halos
consisting of flashes of light that were likened to the appearance of flashes of lightning
- Moore’s Lightning Streaks
- Purkinje Figures
Moore’s Lightning Streaks
“flashes of light”
Associated with stress
- Moore’s Lightning Streaks
- Purkinje Figures
Moore’s Lightning Streaks
“stress”
Images of the retinal blood vessels.
- Moore’s Lightning Streaks
- Purkinje Figures
Purkinje Figures
“retinal blood vessels”
Illumination of the fundus by parallel rays of light will allow visualization of small opacities located close to the retina.
- Moore’s Lightning Streaks
- Purkinje Figures
Purkinje Figures
“visualization of small opacities”
Scheerer’s Phenomenon
- Blue field phenomenon
- Phosphene
Blue field phenomenon
appearance of tiny bright dots moving rapidly along squiggly lines in the visual field.
- Blue field phenomenon
- Phosphene
Blue field phenomenon
“bright dots moving”
caused by white blood cells moving in the capillaries in front of the retina
- Blue field phenomenon
- Phosphene
Blue field phenomenon
“white blood cells moving”
is the perception of light without light actually entering the eye
- Blue field phenomenon
- Phosphene
Phosphene
“perception of light without light”
Results from stimulation of retinal ganglion cells
- Blue field phenomenon
- Phosphene
Phosphene
“retinal ganglion cells”
brought by rapid movement of the eye
- Flick phosphene
- phosphene
Flick phosphene
produced by snneze, laughter, a heavy and deep cough, and blowing of the nose
- Flick phosphene
- phosphene
phosphene
Electrical stimulation of the brain
- Flick phosphene
- phosphene
phosphene
refers to an image continuing to appear in one’s vision after the exposure to the original image has ceased
- Afterimage
- Science of Color
Afterimage
Over stimulation of cones
- Negative
- Positive
Negative
Opposite color of the original object
- Negative
- Positive
Negative
Transmission of impulse from the retina to the brain in a dark adapted eye
- Negative
- Positive
Positive
Same color as the original color
- Negative
- Positive
Positive
That aspect of things that is caused by differing qualities of the light reflected or emitted by an object, definable in terms of the observer.
- Afterimage
- Colors
Colors
That aspect of things that is caused by differing qualities of the light reflected or emitted by an object, definable in terms of the observer.
- Afterimage
- Colors
Colors
That aspect of things that is caused by differing qualities of the light reflected or emitted by an object, definable in terms of the observer.
- Afterimage
- Colors
Colors
That aspect of things that is caused by differing qualities of the light reflected or emitted by an object, definable in terms of the observer.
- Afterimage
- Colors
Colors
That aspect of things that is caused by differing qualities of the light reflected or emitted by an object, definable in terms of the observer.
- Afterimage
- Colors
Colors
The characteristics of light by which the individual is made aware of objects or light sources through the receptors of the eye, described in terms of dominant wavelength, luminance, and purity.
- Colors
- Entoptic Phenomenon
Colors
Sometimes called Chromatics, colorimetry, or simply color science
- Science of Color
- Entoptic Phenomenon
Science of Color
When the wavelength is within 390 nm to 700 nm the human eye can perceive it.
- Physics of Color
- Spectral Colors
Physics of Color
Most light sources emit light at many different wavelengths
- Physics of Color
- Spectral Colors
Physics of Color
a color that is evoked by a single wavelength of light in the visible spectrum, or by a relatively narrow band of wavelengths
- Physics of Color
- Spectral Colors
spectral color
The ________ depends on both the physics of the object relative to its environment and the characteristics of the perceiving eye and brain
- color of an object
- Prurkinje effect
color of an object
The ________ depends on both the physics of the object relative to its environment and the characteristics of the perceiving eye and brain
- color of an object
- Prurkinje effect
color of an object