Eye, vision

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88 Questions - Developed by: V - Developed on: - 853 taken

  • 1
    - accommodation mechanism represents an activation of cones and inhibition of rods on the retina
  • 2
    -accommodation mechanism does not represent an activation of cones and inhibition of rods on the retina
  • 3
    - accommodation mechanism represents an activation of rods and inhibition of cones on the retina
  • 4
    - in myopic (short sighted) eye, light beams focused in front of retina; the defect is corrected by diverging lens
  • 5
    - in hypermetropic (far sighted) eye, light beams focused in front of retina; the defect is corrected by converging lens
  • 6
    - in hypermetropic (far sighted) eye, light beams focused behind the retina; the defect is
    corrected by diverging lens
  • 7
    - myopia (short sight) is corrected by diverging lenses
  • 8
    - myopia is spherical defect of eye, which means that it is different in horizontal and
    vertical directions
  • 9
    - hypermetropia (far sight) is spherical defect of eye, which means that it is different in
    horizontal and vertical directions
  • 10
    - presbyopia is kind of hypermetropia
  • 11
    - myopia is corrected by concave lenses
  • 12
    - myopia is corrected by convex lenses
  • 13
    - myopia is corrected by cylindrical lenses
  • 14
    - accommodation means the ability of eye to focus on (to perceive sharply) close objects
  • 15
    - accommodation means the ability of eye to change its optical power
  • 16
    - optical power of the cornea adjusts by a change of its curvature
  • 17
    - optical power of the cornea adjusts by a change of its distance from the retina
  • 18
    - optical power of human eyes is approx. 60 dioptres
  • 19
    - optical power of human eyes is approx. 90 dioptres
  • 20
    - optical power of human eyes is approx. 30 dioptres
  • 21
    - optical power can be expressed in cm-1
  • 22
    - optical power can be expressed in m-1
  • 23
    - astigmatism is spherical defect of eye, which means that it is different in horizontal and vertical directions
  • 24
    - astigmatism is colour defect
  • 25
    - astigmatism is corrected by concave lenses
  • 26
    - astigmatism is corrected by convex lenses
  • 27
    - astigmatism is corrected by cylindrical lenses
  • 28
    - hypermetropia is a monochromatic defect
  • 29
    - myopia is a monochromatic defect
  • 30
    - eye cornea is crucial for eye accommodation
  • 31
    - colour vision requires spectral decomposition of light in the eye
  • 32
    - colour vision does not require spectral decomposition of light in the eye
  • 33
    - rods and cones send their axons to the temporal lobe of brain (center of vision)
  • 34
    - eye retina contains mainly chemoreceptors
  • 35
    - retina comprises many layers of unipolar and ganglionic cells
  • 36
    - in the human retina the number of rods is higher than the number of cones
  • 37
    - in the human retina the number of cones is higher than the number of rods
  • 38
    - cones are more sensitive to light than the rods
  • 39
    - rods are less sensitive to light than the cones
  • 40
    - there are only cones in the macula lutea of retina providing “photopic“ vision
  • 41
    - there are only rods in the macula lutea of retina providing “photopic“ vision
  • 42
    - there are only rods in the blind spot of the retina
  • 43
    - there are only cones in the blind spot of the retina
  • 44
    - phototransmission is based upon absorption of photons by the photoreceptor pigment molecules
  • 45
    - absorption of light (photon) in the pigment results in alteration of the pigment molecule
  • 46
    - when the layer of ganglionic cells is injured (damaged) perception of light is mediated by fibers and action potentials directly from photoreceptors
  • 47
    - a primary response of photoreceptors to light stimulation is their hyperpolarization
  • 48
    - a primary response of photoreceptors to light stimulation is their depolarization
  • 49
    - after the excitation of photosensitive cells by light the ganglionic cells are depolarized
  • 50
    - after the excitation of photosensitive cells by light the ganglionic cells are hyperpolarized
  • 51
    - cones and rods contain different pigments
  • 52
    - different kind of cones contain different types of pigments
  • 53
    - an optic analyser consists of 3 parts: an eyeball, a retina, and a visual cortex
  • 54
    - we perceive a polychromatic light as a set (an assembly) of many colours
  • 55
    - cones provide perception of colours
  • 56
    - cones are not employed in the discrimination of colours
  • 57
    - rods provide perception of colours
  • 58
    - human eye discerns (distinguishes) approx. 150 colours (colour tones)
  • 59
    - human eye discerns (distinguishes) approx. 250 colours (colour tones)
  • 60
    - human eye discerns (distinguishes) approx. 350 colours (colour tones)
  • 61
    - deuteranomaly is just reduced ability of person to clearly perceive the green colour
  • 62
    - protanopy is the complete loss of ability to perceive the blue colour
  • 63
    - tritanomaly is aspheric defect in perception of the red colour
  • 64
    - tritanopy is lost ability to perceive the blue (and partially yellow) colour
  • 65
    - cataract occurs due to the damage of the eye lens disease
  • 66
    - miosis (reduced size of pupil) occurs when the intensity of light is higher
  • 67
    - meiosis occurs when the intensity of light is lower
  • 68
    - human eye can distinguish two points and perceive them separately if their images reach two different cones at the fovea centralis
  • 69
    - human eye can distinguish two points and perceive them separately if their images reach two different cones
  • 70
    - human eye can distinguish two points and perceive them separately if their images reach two different rods
  • 71
    - visual acuity (Visus) is a fraction (ratio) where a numerator represents the distance of correct reading of signs and a denominator represents the distance of eye examination
  • 72
    - visual acuity (Visus) is a fraction (ratio) where a numerator represents the distance of eye examination and a denominator represents the distance of correct reading of signs
  • 73
    - visual acuity is expressed as a Visus (V)
  • 74
    - visual acuity represents an ability of vision to distinguish two close points (minimum separabile) expressed e.g. as a magnitude of the angle between the light beams from those two points
  • 75
    - visual acuity is examined using Scheiner charts
  • 76
    - accommodation width represents the range of distances at which the eye can provide sharp (focused) vision, or the range of change of optical powers of the eye (in dioptres)
  • 77
    - accommodation width is always entirely determined by the measurement of near point (punctum proximum - PP)
  • 78
    - accommodation width is always entirely determined by the measurement of far point (punctum remotum - PR)
  • 79
    - near point (PP – punctum proximum) is the nearest distance at which the eyes can detect light
  • 80
    - far point (PR - punctum remotum) is the most distant point at which the eyes can detect light
  • 81
    - if PP = 6 D and PR = -2 D, the accommodation width is 8 D; this eye is hypermetropic
  • 82
    - if PP = 6 D and PR = -2 D, the accommodation width is 8 D; this eye is myopic
  • 83
    - if PP = 10 D and PR = 2 D, the accommodation width is 8 D; this eye is myopic
  • 84
    - Snellen types (symbols) are seen from appropriate distance at the angle of 1"
  • 85
    - Snellen types (symbols) are seen from appropriate distance at the angle of 5"
  • 86
    - Snellen types (symbols) are seen from appropriate distance at the angle of 1°
  • 87
    - Snellen types (symbols) are seen from appropriate distance at the angle of 5#
  • 88
    True

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