*6.2.1 Ocular surface disease index (OSDI)*

The OSDI test evaluates the symptoms provided by the patient and the function affection related to vision [30]. This 12-item questionnaire assesses dry eye symptoms and the effects it has on vision-related function in the past week of the patient's life [31]. The questionnaire has 3 subscales: ocular symptoms, visionrelated function, and environmental triggers. Different Scores are provided related to the severity of ocular surface disease [32].
