Arrangement Tests Flashcards

1
Q

What are some advantages of arrangement tests?

A

Identify all types of defect
Can monitor acquired defects
Can assess severity of defects

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2
Q

What are some disadvantages of arrangement tests?

A

Not a screener
If limited dexterity, px may struggle

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3
Q

What distance should you do D15 at?

A

15cm

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4
Q

How many crossings on the D15 is considered a moderate defect?

A

2

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5
Q

How many crossings on the D15 is considered a severe defect?

A

More than 2

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6
Q

What categories are colours separated into in The Munsell System of Specifying Colour?

A

Wavelength (hue)
Value (brightness)
Chroma (saturation)

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7
Q

What Munsell System grades does the D15 use?

A

Hue: various
Value: 5
Chroma: 4

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8
Q

What differences does the desaturated D15 test have? What difference does this make?

A

Reduced value and chroma
Test is more difficult
Picks up milder defects

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9
Q

How is the specificity affected in the desaturated D15?

A

Reduced - more ‘normals’ can fail it

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10
Q

On the Farnsworth-Munsell 100 Hue Test, how much of a misplacement counts as an error?

A

Difference of 2 between neighbouring caps

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11
Q

On the results for a Farnsworth-Munsell test, what does the direction of the spokes indicate?

A

Type of defect

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12
Q

On the results for a Farnsworth-Munsell test, what does the numerical score of the errors indicate?

A

Larger score = higher severity

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13
Q

On the Farnsworth-Munsell, what are the mean positions for a protanope?

A

17 and 64

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14
Q

On the Farnsworth-Munsell, what are the mean positions for a deuteranope?

A

15 and 58

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15
Q

On the Farnsworth-Munsell, what are the mean positions for a tritanope?

A

5 and 45.5

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16
Q

Will the Farnsworth-Munsell pick up mild defects?

A

Yes

17
Q

When is performance best on the Farnsworth-Munsell?

A

Late teens

18
Q

What distance should the City Uni test be performed at?

A

35cm

19
Q

How long should you present each page of the City Uni test for?

A

3 seconds

20
Q

How does the City Uni test work?

A

Each colour around the central dot is either: normal, protan, deutan or tritan

21
Q

Which deficiency makes the least mistakes on the City Uni test?

A

Protans

22
Q

How does the Mollon-Reffin test work?

A

Works out limits of px’s ability to discriminate between hues using staircase method - starts at most desaturated and moves out on each line
Start with protan, then deutan, then tritan
Put each cap within grey caps and ask px to differentiate - if can, reduce saturation, if can’t increase

23
Q

On the tritan line on Mollon-Reffin, what is an acceptable result for a px with possible lens yellowing?

A

T2