The erythema resulting from the minimal erythema dose (MED) test is subjectively assessed. The evaluator visually grades erythema on an ordinal scale. Both intra- and interobserver variation have been found for this erythema assessment. We wanted to examine if objective measurements could be used to confirm the subjective finding.
Photodermatology, Photoimmunology and Photomedicine, 2013, Vol 29, Issue 4, p. 190-195