Ocular surface disability index (OSDI questionnaire)
dry eye, ocular impairment, ’ environmental-activated ocular symptoms
DRY EYE
It is a valid surOcular surface disability index (OSDI questionnaire)vey that rates the severity of DE patients’ environmental-activated ocular symptoms and complaints in the previous week. The survey consists of 12 items, each of which is evaluated on a scale of 0 to 4, with 0 being an indicator of none of the time and 4 being an indicator of all of the time. The OSDI questionnaire includes a total score as well as 3 subscale scores: vision-associated symptoms (5 items), ocular symptoms (4 items), and environmental triggers or stimuli (3 items). The overall score of the OSDI questionnaire is gained by dividing the total score of all answered questions by the number of answered questions and then multiplying the result by 25. Then, the result of this equation was assessed on a 0–100 scale with higher scores detecting the ocular impairment. A 0–12 score of OSDI is an indicator of a normal eye (absence of DE). An OSDI score ≥ 13 is a diagnosis of dry eye [