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MSP > MSP T2 > Flashcards

MSP T2 Flashcards

1
Q

What is kinetic perimetry?

A

A measure of the perimeter of the area of visual field within which a test spot of constant luminance and constant size is visible.

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2
Q

What is static perimetry

A

A measure of the increment threshold luminance for a spot of constant size at different visual field locations

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3
Q

What is sensitivity?

A

Ability to correctly ID those having the disease

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4
Q

What is specificity?

A

Ability to correctly ID those not having the disease as not having the disease(condition)

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5
Q

What do you do if the pupils are too small in HVF?

A

Dilate them

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6
Q

When do you not use a pt’s Rx in static perimetry?

A

When eccentricity is greater than 30 degrees.

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7
Q

If I am testing the right eye on HVF, which side of the VF will the blind spot be on?

A

The right side.

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8
Q

What is the Total visual field limit horizontally?

A

200 degrees

Add up the temporal sides

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9
Q

What is the Binoculra visual field limit horizontally?

A

120 degrees

Add up the nasal sides.

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10
Q

Which VF method uses an isopter?

A

Kinetic Perimetry

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11
Q

What is an isopter?

A

the actual perimeter of the observer’s visual field as measured using kinetic perimetry test conditions.

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12
Q

What is the old school machine used to measure perimetry?

A

Goldmann Bowl Perimeter

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13
Q

How is the size of a stimulus for Goldman bowl perimeter expressed?

A 
On a scale of 0-V
0- 1/16thmm squared
III - 1
V - 64
Multiply by four
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14
Q

What is the unit for intensity for the GOldman Kinetic perimetry?

A

Apostilbs

Candela/m^2

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15
Q

How is the intensity controlled for the Goldman Kinetic Perimetry

A 
In log(10) unit steps
Settings 1-4 represent 0.5 log unit changes
Settings a-e represent 0.1 log unit changes
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16
Q

Is a combination of smaller or larger targets desired for Goldmann?

A

Smaller target is preferred because detection of isopter edges is more accurate with smaller targets.

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17
Q

What is the typical target progression for testing?

A

I1e, I2e, I3e, I4e, II4e, III4e, IV4e, V4e

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18
Q

How do you create a contour map of the VF in Goldman bowl perimetry?

A

By plotting out multiple isopters for different intensities and sizes of stimulus.

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19
Q

Is your blind spot closer to the nasal or temporal side?

A

Temporal.

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20
Q

T/F?

We have noted that structural damage and visual defect loss in test are not congruent?

A

True

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21
Q

What background luminance does the automated perimeter use?

A

10 cd/m^2 (31.4 asb)

This is in the low photopic range.

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22
Q

For the hills of vision, do we have a greater sensitivity under photopic or scotopic conditions?

A

Scotopic conditions.

We have a huge hole in the fovea, bcaz there is no light to see it.

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23
Q

What does background luminance of the perimeter determine?

A

Level of retinal adpation, thus the contour of the hilll of vision

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24
Q

Where do we not have any sensitivity?

A

Our blind spot

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25
Q

Where do we notice peaks in these VF?

A

At 0 degrees, the fovea.

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26
Q

As for the influence of stimulus size; how does one increase spatial summation

A

Increasing retinal eccentricity

Increasing dark adaptation (this results in higher sensitivity)

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27
Q

As for the influence of stimulus size; how does one increase lateral inhibition?

A

Increasing light adaptation

Proximity to the fovea (results in lower sensitivity)

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28
Q

As for the influence of stimulus size; what does a large stimulus under photopic conditions result in?

A

It results in a flat contour

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29
Q

As for the influence of stimulus size; what does a small stimulus under photopic conditions result in?

A

It results in a steep contour in fovea.

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30
Q

What is the best static perimetry stimulus duration?

A

Shorter than the saccadic eye movement latency
Longer than the critical duration for complete temporal summation
200msec is used by HVFs

31
Q

What is the temporal summation duration under photopic and scoptopic conditions?

A

Photopic: 10-50msec
Scotopic: 100 msec

32
Q

What is Newton’s contribution to Color?

A

Began the scientific study of color and color vision

33
Q

How is it possible to see color?

A

Need a light source
Need a detector (our eye)
Need something to look at.

34
Q

What did Faber Birren say about color?

A

Color distracts you from yourself and relieves you of inner anxieties, melancholies, and fears.

35
Q

Who wrote on pure color?

A

Empedocus.

Red, green, blue, yellow. 4

36
Q

Who thought that light emanated from the eye?

A

Plato.

Said that an inner fire gave rise to visual ray.

37
Q

Which scientist experimented with prism?

A

Newton

38
Q

Are colors discontinuous or continuous?

A

Continuous

39
Q

Does light bend more at longer or shorter wavelengths?

A

Shorter wavelengths.

40
Q

Retinal organization consist of what two things?

A
  1. Centripetal

2. Lateral (includes horizontal and amacine cells)

41
Q

The s-cone is more sensitive to….

A

purple. Not blue

42
Q

The l-cone is more sensitive to…

A

yellow. not red.

43
Q

T/F? Rods do not contribute to color?

A

True

44
Q

Diff b/w purkinje shift and photocromatic interval

A

PS: Change in sensitivity when switching from scotopic to photopic conds.
PI - varies with wavelength.

45
Q

why isn’t s cones found in fovea?

A

Bcaz doesn’t contribute to spatial resolution.

46
Q

How does Seger wants us to relate the distribution amongst L-M-s cones?

A

That s cones aren’t found too much in fovea.
That there is high variability amongst the L&M cones.
It doesn’t really matter bcaz will still have normal color vision.

47
Q

Where is the highest degree of cone distribution?

A

1 degree from the macula.

48
Q

Def of univariance?

A

Once something its absorbed, we are unaware of its original properties like its wavelength. slide 18

49
Q

What kind of attribute is color?

A

A perceptual attribute.

50
Q

What kind of attribute is wavelength?

A

A physical attribute.

51
Q

What is an illuminant color?

A

The wavelength of light emitted from a source.

52
Q

What is an object color?

A

Wavelength of light reflected from an object.

53
Q

What are the three primary colors for addition?

A 
Red
Green
Blue
Will get white light if you mix all three of these together.
Related to Abney's law.
54
Q

Abney’s law?

A

The total luminance of light composed of several wavelengths is equal to the sum of the luminances of its monochromatic components.

55
Q

What results in additive conditions?

A

White light

Subtractive primaries.

56
Q

What results under subtractive conditions

A

Black (CMYK)

Additive primaries

57
Q

What is spectral color

A

Obtained directly by prismatic decomposition of sunlight.
Occurs in nature.
Not watered down (saturated)

58
Q

What is non-spectral color

A

Can be obtained only by mixing colors

Not present in sunlight

59
Q

Metamers?

A

2 or more stimuli that have the same color but have different wavelength composition.

60
Q

What are the three components of color?

A

Hue, saturation, brightness.

61
Q

What is the munsell equivalent for brightness?

A

value

62
Q

What is the munsell equivalent for saturation?

A

Stroma

63
Q

Define hue?

A

Associated with wavelength and color names.

64
Q

Def of brightness?

A

the perceived intensity of a color

65
Q

Define saturation?

A

Degree to which a color appears to differ from an equally bright gray.
-A color’s perceived colorimetric purity

66
Q

Is pastel a saturated or desaturated color?

A

Desaturated

67
Q

What is complementary color?

A

Any two colors that, when added together, produce a “neutral color.
On a color circle, lie opposite side of white.

68
Q

Diff b/w saturation and colorimetric purity?

A

Saturation is the perceptual attribute most closely related to the physical attribute of colorimetric purity.

69
Q

The brightness value is determined by what kind of perimetry?

A

Flicker perimetry.

70
Q

Refer to slide 37

A

True that.

71
Q

What is colorimetric purity

A

Describes the proportion of pure, dominant spectral wavelength energy relative to the amt of achromatic (white) luminance objectively present in a color sample.

72
Q

What is a color matching function

A

A person with normal color vision need mix only 3 primary colors in diff proportions to match any color. Value need to add up to 1.0
slide 46

73
Q

COlor gamut

A

The set of all colors that can be obtained from all possible mixtures of a specified set of primary colors.

74
Q

What is a MacAdam Ellipses

A

JNDs for chromaticity for a person with normal color vision.

MSP (1 decks)

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