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The OSDI is a validated 12-item questionnaire that is used to effectively assess the severity of dry eye disease (DED)21. The self-assessment tool has three subsections; ocular symptoms, vision related function and environmental triggers. A final score out of 100 is calculated, with 0–12 representing normal, 13–22 as mild DED, 23–32 as moderate disease and greater than 33 representing severe DED.
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