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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 …
Competing interests None.
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