[Evidence based ophthalmology: critical appraisal skills on clinical trials on treatments].

Arch Soc Esp Oftalmol 85(1):2-10 (2010) PMID 20566163

To analyse and provide the tools to answer three questions that must be asked about a clinical trial on treatments: evaluation of validity (internal validity, so that results are not biased); clinical importance of these results and their application to individual patients. We provide simple statistics tools, clinical trial design, and clinical epidemiology for the evaluation and analysis of clinical trials on treatments.