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The authors also present before and after photographs of three patients. LEVEL OF EVIDENCE IV This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .In this letter, we describe a method about disposable medical hydrogel recommended inside surgical masks to reduce the water vapor in the goggles. The introduction is as follows.Level of Evidence V