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Purpose: To evaluate the reliability and validity of the Thai version of the Ocular surface disease index (T-OSDI)
Setting/Venue: Online-based survey, Ophthalmology Department at Thammasat Hospital, Thailand
Methods: Translation of the Ocular Surface Disease Index (OSDI) from English version to Thai version was done by ophthalmologists and linguists using focus group analysis. Content validity of the translated survey was assessed by 10 examiners who are fluent in both English and Thai. The examiners are 2 corneal and refractive surgery specialists, 2 general ophthalmologists, 2 general practitioners, 2 health care personnel in the ophthalmology department and 2 language experts. Validity indexes, Item Objective Congruence (IOC) and Content Validity Index (CVI); Item level CVI & scale level CVI were evaluated. 291 participants with consent completed the T-OSDI by an online database survey but 1 was excluded due to age under the criteria. The reliability was evaluated by Cronbach’s Alpha coefficient.
Results: The indexes of item-objective congruence (IOC) ranged from 0.73 to 1.0 per each question with a mean of IOC 0.934, Item-level Content Validity Index scores (I-CVI) ranged from 0.91 to 1.00 per each question with a mean of CVI of 0.99, total scale-level Content Validity Index (S-CVI) is 0.91, Cronbach Alpha Coefficient value for reliability ranged from 0.831 and 0.855 per each question with a mean of Cronbach Alpha Coefficient value is 0.853
Conclusion: The Thai version of the Ocular surface disease index (T-OSDI) has high validity and reliability and can be applied to the Thai population for diagnosis of Dry eye disease
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