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Reliability and validity of conjunctival ultraviolet autofluorescence measurement

Citation

Sherwin, JC and McKnight, CM and Hewitt, AW and Griffiths, LR and Coroneo, MT and Mackey, DA, Reliability and validity of conjunctival ultraviolet autofluorescence measurement, British Journal of Ophthalmology, 96, (6) pp. 801-805. ISSN 0007-1161 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 British Medical Journal Publishing Group

DOI: doi:10.1136/bjophthalmol-2011-301255

Abstract

Background: Conjunctival ultraviolet autofluorescence (UVAF) photography was developed to detect and characterise pre-clinical sunlight-induced UV damage. The reliability of this measurement and its relationship to outdoor activity are currently unknown. Methods: 599 people aged 16-85 years in the cross-sectional Norfolk Island Eye Study were included in the validation study. 196 UVAF individual photographs (49 people) and 60 UVAF photographs (15 people) of Norfolk Island Eye Study participants were used for intra- and inter-observer reliability assessment, respectively. Conjunctival UVAF was measured using UV photography. UVAF area was calculated using computerised methods by one grader on two occasions (intra-observer analysis) or two graders (inter-observer analysis). Outdoor activity category, during summer and winter separately, was determined with a UV questionnaire. Total UVAF equalled the area measured in four conjunctival areas (nasal/temporal conjunctiva of right and left eyes). Results: Intra-observer (ρ-c=0.988, 95% CI 0.967 to 0.996, p<0.001), and inter-observer concordance correlation coefficients (ρ-c=0.924, 95% CI 0.870 to 0.956, p<0.001) of total UVAF exceeded 0.900. When grouped according to 10 mm 2 total UVAF increments, intra- and inter-observer reliability was very good (κ=0.81) and good (κ=0.71), respectively. Increasing time outdoors was strongly with increasing total UVAF in summer and winter (p trend <0.001). Conclusion: Intra- and inter-observer reliability of conjunctival UVAF is high. In this population, UVAF correlates strongly with the authors' survey-based assessment of time spent outdoors.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Ophthalmology and Optometry
Research Field:Ophthalmology
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Hearing, Vision, Speech and Their Disorders
Author:Hewitt, AW (Dr Alex Hewitt)
Author:Mackey, DA (Professor David Mackey)
ID Code:83024
Year Published:2012
Web of Science® Times Cited:17
Deposited By:Medicine (Discipline)
Deposited On:2013-02-27
Last Modified:2016-11-24
Downloads:0

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