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Recently, Chauhan et al presented recommendations for measuring rates of visual field change in glaucoma.1 Unlike event detection, assessment of this “rate of progression” should permit the prediction of blindness occurring during lifetime and thus provide information on the need for treatment or its intensification.2 They emphasised the need for frequent perimetry in glaucoma and ended with recommending six fields in the first 2 years. However, although they stressed the importance of the assessment of the rate of progression (depicted by a mean deviation (MD) slope), their analyses actually addressed the question of how many fields are needed to detect a slope significantly different from zero, leaving unanswered the question of how accurately that slope can be determined. The aim of this letter is to address the latter question. For this purpose, model calculations were performed similar to that of Chauhan et …
Funding University Medical Center Groningen.
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.