Cultural adaptation and validation of the Ocular Surface Disease Index Questionnaire (OSDI) to the Mexican population

Translate, culturally adapt, and validate the Ocular Surface Disease Index into Spanish for the Mexican population.

To ensure fluency and comprehensibility, we employed the Crawford and INFLEZS indexes. The Content Validity Coefficient was used to assess coherence, relevance, clarity, and sufficiency. Internal consistency was evaluated using Cronbach's Alpha Coefficient.

A total of 372 participants were included in the study (63.4%, women; age ranged from 17 to 86 years). According to the INFLEZS readability index, symptom-related items achieved scores of 82.56, 72.69, 85.81, 73.24, and 74.24. Lifestyle-related items obtained scores of 71.39, 76.90, 58.27, and 72.56, while in the environmental domain, scores of 83.61, 74.03, and 58.93 were recorded. Using the Crawford index, symptom scores were 3.6, 4.6, 3.5, 4.1, and 3.8, lifestyle scores were 4.7, 4.1, 5.1, and 4.6, and environmental scores were 3.7, 4.4, and 5.7. The Cronbach's alpha coefficient was 0.868. Based on the scores from the OSDI questionnaire, patients were categorized as having no dry eye (n = 129), mild dry eye (n = 99), moderate (n = 45), and severe dry eye (n = 99).

This study developed and validated the Mexican version of the Ocular Surface Disease Index, while assessing its reliability and internal consistency. With this tool, ophthalmologists and researchers alike will be able to assess and monitor Mexican-Spanish-speaking patients with dry eye in their routine clinical practice and future research.