Color Vision Testing

Paramei, Galina V.; Bimler, David

doi:10.1007/978-3-642-27851-8_374-2

Cited by 1 publication

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“…The purpose of the present study was to investigate colour discrimination of pCPs using the Farnsworth-Munsell 100-Hue test (FM-100) 21,22 that has been widely employed to assess CV (for reviews see Refs. [23][24][25][26] ). The FM-100 analysis of the cap arrangement allows to quantify observer's colour discrimination in relation to normative scores for healthy normal trichromats of the corresponding age group [27][28][29][30] , as well as to determine the predominant axis of colour confusion 31 .…”

Section: Introductionmentioning

confidence: 99%

Colour discrimination in post-COVID-19 observers assessed by the Farnsworth-Munsell 100-Hue test

Paramei

Griber

2023

Preprint

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Post-COVID-19, recorded were various ophthalmological symptoms and visual impairment. We hypothesised that colour vision may be affected too. We assessed colour discrimination using the Farnsworth-Munsell 100 Hue test (FM-100) in individuals, who have had COVID-19 (N=77; 18–68 years). Total error score (TES) indicated superior colour discrimination in 34 observers. The Vingrys–King-Smith C-index (severity) exceeded the normal cutoff measure in 44 observers. In participants (N=35) with average TES, the Vingrys–King-Smith analysis revealed subtle colour deficiencies – either a mild tritan defect (‘blue’ or blue-yellow) or moderate defect with a diffuse error pattern. A minor sub-sample (N=6) manifested poor discrimination or colour vision loss (N=2), with a tritan or diffuse error pattern. √TES negatively correlated with the recovery time lapse. Partial error scores (√PES) indicated prevailing B–Y errors, regardless of the elapsed post-illness period. Overall, the results indicate that about half of those who have recovered from COVID-19 reveal predominantly mild Type III acquired colour discrimination loss, characteristic of retinal disorders and vascular disease. Conceivably, coronavirus infection caused hypoperfusion (reduced vascular supply) at the retinal and/or post-retinal stages of the visual system having affected neural mechanisms of colour discrimination. The mild impairment appears to be reversible with a favourite prognosis.

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