Assessing the Severity of Color Vision Loss with Implications for Aviation and Other Occupational Environments

Rodriguez‐Carmona, Marisa; O'neill‐Biba, M; Barbur, John L.

doi:10.3357/asem.3111.2012

Cited by 43 publications

(54 citation statements)

References 10 publications

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“…A threshold of 2 SNU means that the subject requires twice the color signal strength of the median normal trichromat. In cone contrast space, this corresponds approximately to doubling the cone photoreceptor contrasts [39].The inset histogram shows the age distribution within the group with a mean age of 29.5 years. The display was viewed with both eyes under optimum conditions and the measurements were carried out using the CAD test.…”

Section: Resultsmentioning

confidence: 99%

Changes in color vision with decreasing light level: separating the effects of normal aging from disease

Barbur¹,

Konstantakopoulou²

2012

J. Opt. Soc. Am. A

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. The purpose of this study was to obtain additional information about the health of the retina (HR) by measuring the rate of loss of chromatic sensitivity with decreasing light level. The HR index is introduced to separate the effects of normal aging from early stage disease. For normal subjects the HR index is largely independent of age (r 2 ∼ 0.1), but ∼11% of clinically normal, asymptomatic, older subjects exhibit values below the 2σ limit. The HR index provides a single number that captures how light level affects chromatic sensitivity irrespective of age and can be used to screen for preclinical signs of retinal disease. Permanent

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Section: Resultsmentioning

confidence: 99%

Changes in color vision with decreasing light level: separating the effects of normal aging from disease

Barbur¹,

Konstantakopoulou²

2012

J. Opt. Soc. Am. A

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“…In the case of pseudo-isochromatic plate tests, the number of errors the subject makes is often taken as a measure of the severity of loss. Although, in general, subjects with severe loss of RG color vision tend to produce larger error scores, the total error scores correlate very poorly with the subject's loss of chromatic sensitivity (Rodriguez-Carmona, O'Neill-Biba, and Barbur, 2012). A number of new tests which emulate the Ishihara test plates on visual displays have been developed recently by generating static colored spots or patches that vary randomly in size and luminance so as to isolate the use of color signals (Birch et al, 1992;Regan et al, 1994;Wong et al, 2008).…”

Section: Methods Employed To Assess Chromatic Sensitivity -Isolation mentioning

confidence: 99%

Color vision changes in normal aging

Barbur¹,

Rodriguez‐Carmona²

2015

Handbook of Color Psychology

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“…Results indicated that despite the differences between the spectral emission of the monitor and the reflected daylight with conventional Ishihara plates, the computer-based method correctly discriminated subjects with colour deficiencies from those without such deficiencies. However, Rodriguez-Carmona et al 11 noted that approximately 20% of normal trichromats fail the test, suggesting limitations in its application.…”

Section: Hoffmann and Menozzimentioning

confidence: 99%

Comparing the validity of an online Ishihara colour vision test to the traditional Ishihara handbook in a South African university population

Staden

Mahomed

Govender

et al. 2018

Afr. vis. eye health

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Background: Colour vision tests are becoming increasingly available on online platforms to the ordinary internet user. Limited research has been conducted to establish the validity of these tests for use as screening tools for colour deficiency.Aim: To compare the validity of an online version of the Ishihara colour vision test (OV-PSI) with the traditional Ishihara handbook (PSI).Setting: This study was conducted at the University of KwaZulu-Natal’s optometry clinic in Durban, South Africa, in 2014.Methodology: One hundred and twenty participants (N = 120), between the ages of 18 and 25 years who visited the University of KwaZulu-Natal’s eye clinic between June and August 2014, were recruited to the study. Colour vision testing was administered using the Ishihara 38 plate test and the ColBlindor Ishihara 38 plate colour vision test available online. Both tests were administered on normal sighted university student participants under standardised conditions, and responses were captured on Ishihara recording sheets. Data were analysed using the Statistical Package of Social Science (SPSS) version 21.Results: Of the 120 participants, 47.5% were men and 52.5% were women with a mean age of 20.64 ± 2.09 years. Results demonstrated that 5.3% of men (N = 3) were colour deficient, resulting in a prevalence of colour deficiency for the sampled population of 2.5%. Results of the two testing methods were compared, revealing sensitivities and specificities for both tests of 100%. However, while the online test correctly discriminated colour deficient participants from colour normal participants, it was unable to correctly identify the severity or type of deficiency.Conclusion: The online version of the Ishihara test used in this study proved a valid screening tool for colour vision deficiency. It presents the opportunity for self-screening via convenient online platforms. However, if colour deficiency is detected using this online tool, it is recommended that further clinical investigation be undertaken for a more accurate diagnosis of the extent of colour vision deficiency.

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Assessing the Severity of Color Vision Loss with Implications for Aviation and Other Occupational Environments

Abstract: This is the unspecified version of the paper.This version of the publication may differ from the final published version. Permanent

Cited by 43 publications

References 10 publications

Changes in color vision with decreasing light level: separating the effects of normal aging from disease

Changes in color vision with decreasing light level: separating the effects of normal aging from disease

Color vision changes in normal aging

Comparing the validity of an online Ishihara colour vision test to the traditional Ishihara handbook in a South African university population

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