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Editor,—In their article, Elliset al claimed to have “reviewed all potentially relevant English language articles from 1966 to 1997.”1 It is unfortunate that they did not define the method of detecting such articles as it may have cast light upon the omission of perhaps the most complete study yet performed on the subject.2 This was published in April 1997, nearly 2 years before the publication of the perspective and approximately 6 months before the Royal College Guidelines on Ocular Hypertension and Glaucoma (although after the “last revision” date). The inclusion of other articles from 1997 in the reference list would appear to indicate that their quoted dates of 1966 to 1997 were inclusive rather than exclusive. The findings of a positive association of open angle glaucoma with …