Impact of blur on clinical and occupational colour vision test results.
CAD test
CCT
Ishihara test
colour vision testing
lantern tests
refractive blur
uncorrected refractive error
Journal
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)
ISSN: 1475-1313
Titre abrégé: Ophthalmic Physiol Opt
Pays: England
ID NLM: 8208839
Informations de publication
Date de publication:
21 Jun 2024
21 Jun 2024
Historique:
revised:
03
06
2024
received:
21
03
2024
accepted:
06
06
2024
medline:
20
7
2024
pubmed:
20
7
2024
entrez:
20
7
2024
Statut:
aheadofprint
Résumé
To evaluate whether colour vision normal (CVN) adults pass two Fletcher-Evans (CAM) lantern tests and to investigate the impact of imposed blur on Ishihara, CAM lantern and computerised colour discrimination test (colour assessment and diagnosis test [CAD] and Cambridge colour test [CCT]) results. In a pilot experiment, 20 (16 CVN and 4 colour vision deficient [CVD]) participants with normal VA were tested with the CAM lantern. In the main experiment, the impact of imposed dioptric blur (up to +8.00 D) on visual acuity and the Ishihara test, CAM lantern, CAD and CCT was assessed for 15 CVN participants. CVN participants can fail the CAM lantern, with specificity of 81.25% (aviation mode) and 75% (clinical mode), despite following the test requirements of participants having at least 0.18 logMAR (6/9) in the better eye. With blur, test accuracy was affected. As expected, significant detrimental effects of blur on test results were found for logMAR VA and CAM lantern (aviation) with +1.00 D or higher. Ishihara, CAD and CCT results were not detrimentally affected until +8.00 D. Yellow-blue discrimination was more affected by blur for the CAD than the CCT, which was not explained by the different colour spaces used or vectors tested. False-positive findings on lantern colour vision tests with small apertures are likely to be increased in patients with blur due to uncorrected refractive error or ocular and visual pathway disease. Other colour vision tests with larger stimuli are more robust to blur.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : University of Huddersfield
ID : URN020-01
Organisme : HEFCE QR (Quality Related) Funds (Anglia Ruskin University)
Informations de copyright
© 2024 The Author(s). Ophthalmic and Physiological Optics published by John Wiley & Sons Ltd on behalf of College of Optometrists.
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