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A survey of ophthalmic publications carried out using the Medline database revealed that during 1983 the search terms contrast and sensitivity appeared in immediate conjunction within the indexing fields of 74 publications. By 1993, this figure had risen to 325. Though a search conducted in this manner would by no means retrieve all the relevant publications, this fourfold increase would suggest...
Method-comparison studies, in which new candidate techniques are compared with an established gold standard , feature commonly in optometric research. Investigators often analyse their findings using least squares regression. Pearson's product-moment correlation coefficient and the paired t-test. We describe more appropriate methods which included: the limits of agreement , the intraclass...