Arrangement Tests Flashcards
What are some advantages of arrangement tests?
Identify all types of defect
Can monitor acquired defects
Can assess severity of defects
What are some disadvantages of arrangement tests?
Not a screener
If limited dexterity, px may struggle
What distance should you do D15 at?
15cm
How many crossings on the D15 is considered a moderate defect?
2
How many crossings on the D15 is considered a severe defect?
More than 2
What categories are colours separated into in The Munsell System of Specifying Colour?
Wavelength (hue)
Value (brightness)
Chroma (saturation)
What Munsell System grades does the D15 use?
Hue: various
Value: 5
Chroma: 4
What differences does the desaturated D15 test have? What difference does this make?
Reduced value and chroma
Test is more difficult
Picks up milder defects
How is the specificity affected in the desaturated D15?
Reduced - more ‘normals’ can fail it
On the Farnsworth-Munsell 100 Hue Test, how much of a misplacement counts as an error?
Difference of 2 between neighbouring caps
On the results for a Farnsworth-Munsell test, what does the direction of the spokes indicate?
Type of defect
On the results for a Farnsworth-Munsell test, what does the numerical score of the errors indicate?
Larger score = higher severity
On the Farnsworth-Munsell, what are the mean positions for a protanope?
17 and 64
On the Farnsworth-Munsell, what are the mean positions for a deuteranope?
15 and 58
On the Farnsworth-Munsell, what are the mean positions for a tritanope?
5 and 45.5