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Bill Harvey recommends the Cochrane Library as an essential resource with a refreshing absence of bias
I have long been wary of subjective rating based research. Asking a patient how they feel in a certain type of contact lens or how they rate the vision through a particular spectacle lens seemed to me fraught with potential pitfalls. The question itself will introduce bias ('is this more comfortable?' 'can you see better now?') and may mask external influences such as a free supply of the new lens/product. I assumed that objectivity had to be the key.
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