Color Vision Testing - Pseudochromatic Plates

Question 1

What illumination is most appropriate for Color Vision Testing?

A) Illuminant A (Incadescent) 2856 K
B) Illuminant B (Direct sunlight) 4874 K
C) Illuminant C (Average Daylight) 6774 K
D) Illuminant D (Phases of Daylight)

Answer 1

C) Illuminant C (Average Daylight) 6774 K

Question 2

What is the best equipment to use to mimic daylight illumination?

A) True daylight Illuminator
B) Daylight Fluorescent
C) Cool White Fluorescent
D) Warm White Fluorescent

Answer 2

A) True daylight Illuminator

Question 3

Pick three that are Psuedochromatic Plates

A) Ishihara
B) Farnsworth D-15
C) HRR
D) Color Vision Made Easy
E) Anomaloscope

Answer 3

A) Ishihara
C) HRR
D) Color Vision Made Easy

Question 4

Describe Pseudochromatic Plates

(What type of physical descrimination is descriminated, How it works, Testing Procedure: Monocular binocular, Tint? Working distance? How many seconds per card?)

Answer 4

• Wavelength is descriminated
• Colors fall on color confusion line
• Procedure: Monocular testing, No tint/filters, working distance at arms length, 3 seconds per card

Question 5

Describe Ishihara

Test R-G/B-Y?, What does transformation Plates, vanishing Plates, Hidden Digit and Diagnostic Plates do?

Answer 5

• Tests Red-Green defect only (heretidary)
• Not Blue-Yellow
• Transformation plate: color deficient see different #
• Vanishing plate: color deficient see no #
• Hidden digit: color normal see no #
• Diagnostic Plate: Diagnose protan/deutan severity

Question 6

How do you record the results for Ishihara?

First 7 plates, what happens if you miss any plate, Plates 16-17 test for what?

Answer 6

• Need to get 7/7, 8/8 for first plates
• If any plates missed, test all plates. 13/15 - normal, 10-12/15 - borderline, re Strong (Severe anomalous trichromat, dichromat) or Anomolous Trichromat

Question 7

Describe HRR

Test R-G/B-Y?, Vanishing Plates and Diagnostic Plates do?

Answer 7

• Tests Red-Green and Blue-Yellow defects

- Vanishing plates define severity of color vision deficiency (Dichromat are more distant)

Question 8

How do you record the results for HRR?

demo and screening plates, what happens if you miss any plate, Plates 11-24 test for what?

Answer 8

• Screening: If all correct: Color Normal
• If any screening plates fail do the diagnostic plates. (11-24)
• If all diagnostic plates correct, color normal.
• Whichever has more checks in Protan/Duetan box determines defect

Question 9

If a person has a “mild” classification with HRR will they most likley be able to name surface colors? (YES/NO)

Answer 9

• YES

Question 10

Which is FALSE about the differences between Ishihara and HRR?

A) Ishihara only tests Red-Green defect
B) Only HRR has transformation plates
C) HRR does not have hidden digit plates
D) Ishihara classified defect as Mild or Strong

Answer 10

B) Only HRR has transformation plates

Only Ishihara has transformation plates where color deficient see’s different numbers

Question 11

Describe Color Vision Made Easy

(Who is it designed for, Does it have vanishing plates?, What is required to pass Shapes and Symbols, What is the documentaiton for color vision made easy?)

Answer 11

• Designed for children and those with developmental delays
• Has Vanishing plates for shapes
• Must get 8/9 on first attempt or 9/9 on second attempt to pass Shapes
• Must identify all Symbols to pass
• Documentation is Pass/Fail/Questionable