The magnitude of discomfort glare has often been evaluated using the de Boer rating scale. This note raises doubts about measuring discomfort glare this way. There is a possibility that the presence of discomfort may be a false alarm because this rating scale forces an opinion and/or because the response scale does not include a `no glare' option. Further, there is a possibility that response variance is increased through uncertainty over the meaning of the magnitude descriptors. Actions that will reduce the likelihood of such distortions occurring are suggested.
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