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Colour vision.


Image A


01 The circular plot shown in Image A is associated with the:

a/ Cambridge Colour Test

b/ Farnsworth-Munsell 100 hue test

c/ Colour Discrimination and Diagnosis test

d/ Farnsworth D15 test

02 What class of colour vision deficiency is illustrated in Image A?

a/ Protan

b/ Deutan

c/ Tritan

d/ Monochromatism

03 What percentage of the general population is likely to suffer from the congenital colour vision deficiency illustrated in Image A?

a/ 0.0001%

b/ 0.35%

c/ 5%

d/ 8%

Image B


04 What is shown in Image B?

a/ Hardy, Rand and Rittler test plate

b/ CIE chromaticity diagram

c/ Electromagnetic spectrum

d/ Friedenwald nomogram

05 With reference to the blue solid lines in Image B, which of the following statements is correct?

a/ The origin of these lines is called the co-punctal point

b/ They represent the confusion lines for a tritanope

c/ The different colours along these lines are distinguishable to the colour deficient person

d/ The lines never pass through the white-point

06 Having studied Image B, and with further consideration, what are the coordinates of Illuminant E?

a/ 0, 0

b/ 1/3, 1/3

c/ 1/2, 1/2

d/ 1, 1

Image C


07 At what distance should the colour vision test shown in Image C be performed?

a/ 0.35m

b/ 0.50m

c/ 0.75m

d/ 1.00m

08 One of the main functions of the test plate shown in Image C is to:

a/ Quantify the severity of a tritan defect

b/ Differentiate between protan and deutan type defects

c/ Identify malingering

d/ Diagnose rod monochromatism

09 What is one of the main limitations of the colour vision test that comprises the plate shown in Image C?

a/ Can only be used on patients who are numerate

b/ Each plate needs to be viewed for approximately 40 seconds

c/ It cannot differentiate between protan and deutan defects

d/ The test is unable to test for tritan defects

Image D


10 What is the name of the test shown in Image D?

a/ Farnsworth Lantern Test

b/ Nagel's anomaloscope

c/ Pseudoisochromatic Plate Colour Vision Test

d/ City University Test

11 Regarding the test shown in Image D, which of the following statements is correct?

a/ This version requires the patient to select the peripheral colour that looks least like the central colour

b/ It is able to screen for tritan defects

c/ It can only be used on patients who are literate

d/ It provides a definitive diagnosis of the patients colour vision status

12 What is the correct working distance of the test shown in Image D?

a/ 0.35m

b/ 0.50m

c/ 0.75m

d/ 1.00m

Exam questions

Under the enhanced CET rules of the GOC, MCQs for this exam appear online at Please complete online by midnight on September 5, 2015. You will be unable to submit exams after this date. Answers will be published on and CET points will be uploaded to the GOC every two weeks. You will then need to log into your CET portfolio by clicking on 'MyGOC' on the GOC website ( to confirm your points.


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A colour vision themed recognition test is presented to assess the practitioner's ability to identify and interpret different methods of investigating this aspect of visual function.

Course code: C-41353 Deadline: September 5, 2015


To be able to explain to patients about colour vision anomalies (Group 1.2.4)

To be able to identify and interpret different methods for assessing colour vision (Group 3.1.4)



Having completed this CET exam, consider whether you feel more confident in your clinical skills--how will you change the way you practise? How will you use this information to improve your work for patient benefit?

Dr Leon Davies PhD, FCOptom, FAAO, SFHEA

Leon Davies is director of research and a reader in Optometry and Physiological Optics at Aston University. He is a previous clinical editor of Optometry Today and is currently an editorial board member of the College of Optometrists' CET journal Optometry in Practice. He holds fellowships with the College of Optometrists, the American Academy of Optometry and a senior fellowship with the Higher Education Academy.
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Author:Davies, Leon
Publication:Optometry Today
Date:Jul 11, 2015
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