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Reliability and validity of conjunctival ultraviolet autofluorescence measurement

We were interested to read the paper by Sherwin and colleagues1 in the June 2012 issue of British Journal of Ophthalmology . The authors report intra-observer (ρ\_c=0.988, 95% CI 0.967 to 0.996, p<0.001) and interobserver (ρ\_c=0.924, 95% CI 0.870 to 0.956, p<0.001) concordance correlation coefficients of total ultraviolet autofluorescence (UVAF) exceeded 0.900. As the authors point out in their conclusion, intra and …