Too Many Shades of Grey: Photometrically and Spectrally Mismatched Targets and Backgrounds in Printed Acuity Tests for Infants and Young Children.
Cardiff Cards
Keeler Acuity Cards
Lea Paddles
Peekaboo Vision
Teller Cards
visual acuity
Journal
Translational vision science & technology
ISSN: 2164-2591
Titre abrégé: Transl Vis Sci Technol
Pays: United States
ID NLM: 101595919
Informations de publication
Date de publication:
11 2020
11 2020
Historique:
received:
19
12
2019
accepted:
24
09
2020
entrez:
26
11
2020
pubmed:
27
11
2020
medline:
27
11
2020
Statut:
epublish
Résumé
Acuity tests for infants and young children use preferential looking methods that require a perceptual match of brightness and color between grey background and target spatial average. As a first step in exploring this matching, this article measures photometric and colorimetric matches in these acuity tests. The luminance, uniformity, contrast, and color spectra of Teller Acuity Cards, Keeler Acuity Cards for Infants, and Lea Paddles under ambient, warm, and cold lighting, and of grey-emulating patterns on four digital displays, were measured. Five normal adults' acuities were tested at 10 m observationally. Luminance and spectral mismatches between target and background were found for the printed tests (Weber contrasts of 0.3% [Teller Acuity Cards], -1.7% [Keeler Acuity Cards for Infants], and -26% [Lea Paddles]). Lighting condition had little effect on contrast, and all printed tests and digital displays met established adult test luminance and uniformity standards. Digital display grey backgrounds had very similar luminance and color whether generated by a checkerboard, vertical grating, or horizontal grating. Improbably good psychophysical acuities (better than -0.300 logMAR: (logarithm of the minimum angle of resolution)) were recorded from adults using the printed tests at 10 m, but not using the digital test Peekaboo Vision. Perceptible contrast between target and background could lead to an incorrectly measured, excessively good acuity. It is not clear whether the luminance and spectral contrasts described here have clinically meaningful consequences for the target patient group, but they may be avoidable using digital tests. Current clinical infant acuity tests present photometric mismatches that may return inaccurate testing results.
Identifiants
pubmed: 33240565
doi: 10.1167/tvst.9.12.12
pii: TVST-19-2203
pmc: PMC7671855
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Pagination
12Informations de copyright
Copyright 2020 The Authors.
Déclaration de conflit d'intérêts
Disclosure: G. Vivas-Mateos, None; I.A.T. Livingstone, None; R. Hamilton, None; A. Cheema, None; M.E. Giardini, None
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