Abstract
The evaluation of colour vision and discrimination of an individual forms an integral part of a routine eye and vision examination. With the increasing prevalence of inherited colour vision deficiencies, defects of colour vision can be detected in an optometric practice by means of a variety of tests available. The present article comprises an overview of the design and function of a selection of colour vision tests that are administered manually and, in some cases, have been modified to form a computerised version.
Highlights
With the increasing importance of colour discrimination needed for various activities, as well as colour vision deficiencies (CVD) that occur as a result of congenital or acquired conditions, colour vision screenings and examinations are used for early identification of CVD, and for monitoring the progression or remission of disease
In a study in 160 normal trichromats by Paramei[1], using the Cambridge Colour Test (CCT) to assess colour discrimination across four life decades, the results indicated no significant differences in the CCT outcomes between two groups of normal trichromatic young adults (20–29- or 30–39-year-olds)
Colour vision screening for individuals with intellectual disabilities can be done using tests adapted with easier procedures because limited comprehension of testing expectations on the part of patients can lead to confusion in their responses, which makes it difficult to determine whether such a patient is manifesting a colour deficiency or not understanding the given instructions.[2]
Summary
With the increasing importance of colour discrimination needed for various activities, as well as colour vision deficiencies (CVD) that occur as a result of congenital or acquired conditions, colour vision screenings and examinations are used for early identification of CVD, and for monitoring the progression or remission of disease. Colour vision loss may sometimes occur from the side-effects of certain drugs used in the treatment of diseases such as diabetes, hypertension, HIV and AIDS and others.[1]. Colour vision can be assessed qualitatively and quantitatively using tests that are grouped as arrangement tests, matching tests, vocational tests or pseudo-isochromatic plates. Sometimes simple or more sophisticated computerised procedures, such as the Cambridge Colour Test (CCT), are used to evaluate colour function or discrimination
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