Finals - (4) Visual Sense Flashcards
what are 7 visual capabilities?
mobility, accommodation, adaptation, color discrimination and perception, visual acuity, contrast sensitivity, perception
what are the most rotational movements in mobility?
1.) left, right (yaw)
2.) up, down (pitch)
3.) roll
4.) forward, backward
it is the succession of fast movements in jumps to catch up to the visual target
saccades
what is the reverse movements?
regressions
in fixations, what is the area, measured in degrees within which the form and color of the objects can be seen by both fixated eyes?
visual field
it is the eye pitch angle with regard to the head
line-of-sight angle (LOSA)
what is the ability of the lens of the eyes to focus on targets at various distances?
accommodation
what are the distances that the ability of the lens of the eyes focus on?
normal focus, nearsighted focus, and farsighted focus
what is the ability of the eyes to change in the sensitivity to light?
adaptation
what are the 2 types of adaptation?
dark and light adaptation
in color discrimination, how do we determine the colors ?
chromaticity diagram
TRUE OR FALSE
Not all areas of the retina are equally sensitive to color
true
TRUE OR FALSE
we see colors while looking straight ahead and at the periphery of our visual field
false
we can’t see colors at the periphery of the visual field
what test is used to figure the degree of your visual impairment other than your eye shape, myopia, hyperopia, and astigmatism and is used as the basis to measure your correct vision?
refraction test
in color perception, what colors do we perceived with 50° to the side from straight ahead?
green, red, and yellow
in color perception, what color do we perceived with 60° to the side from straight ahead?
blue
in color perception, what color do we perceived with 90° to the side from straight ahead?
white
what are the 3 possible configurations of the human visual system?
monochromats, dichromats, trichromats
what is the ability to discriminate the fine detail and differentiate small objects?
visual acuity
what is the smallest space between the parts of a target that the eye can detect?
minimum separable acuity
what is the ability to differentiate the lateral displacement of one line from another?
vernier acuity
what is the ability to detect a spot (such as a round dot) from its background?
minimum perceptible acuity
what is captured by the human eye and processed into an image by the brain?
light
where do light rays passes through and through?
pupil, an opening in the eye, and through the cornea and lens
it is composed of photosensitive receptors
retina
this is sensitive to black and white, especially at night, but have poor visual acuity
rods
this are sensitive to colors in daylight but have a good visual acuity
cones
what part of the eye are concentrated in the fovea?
cones
what part of the eye are spread out over the retina?
rods
where do collected electrical signals from the photoreceptors passes by to go to the brain where the light from external illumination is processed and interpreted?
optic nerve
the basic theory of illumination applies to a point source of light (e.g. candle) of a ?
luminous intensity, measured in candela (cd)
what do you call the amount of light striking a surface or a section of a sphere?
illumination or illuminance, measured in footcandles (fc)
the illuminance decreases as the light source increases
angle of incidence
what is the amount of light reflected from the surface?
luminance
this depends on the amount of light towards the surface, color, and texture of the surface
luminance
luminance is measured in?
foot-lamberts (fl)
luminance is determined by the reflective properties of the surface known as?
reflectance
it is a unitless proportion that ranges from 0 to 100
reflectance
