Contact lens & anterior eye : the journal of the British Contact Lens Association
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Cont Lens Anterior Eye · Oct 2012
Randomized Controlled Trial Comparative StudyComparison of patient-reported visual outcome methods to quantify the perceptual effects of defocus.
Patient-reported subjective responses have become increasingly popular in describing contact lens visual performance and discriminating between designs. The purpose of the current study is to evaluate the ability of patient-reported measures of vision to quantify the perceptual effects of defocus. ⋯ The NRS and VAS yield virtually identical rating responses, but both differing slightly, however from the CRS. Each scale successfully discriminated levels of blur smaller than 0.25 D with only a single measurement.