The Turkish Adult Strabismus Quality of Life Questionnaire (AS-20): A Psychometric Validation Study.

OBJECTIVES

To translate the Adult Strabismus Quality of Life Questionnaire (AS-20) into Turkish and evaluate its reliability and validity in Turkish adult patients with strabismus.

MATERIALS AND

METHODS

Adult patients diagnosed as having strabismus and followed at the pediatric ophthalmology and strabismus unit of a tertiary university hospital were consecutively recruited. Patients with previous strabismus surgery, cognitive impairment, or insufficient Turkish language proficiency were excluded. A group of 15 participants completed the questionnaire a second time after a 2-week interval to evaluate test-retest reliability.

RESULTS

A total of 111 adult patients (63.1% female) were included in the analysis. The mean age was 32.0±14.5 years, and exotropia was the most common deviation pattern (85.1%). Diplopia was present in 7.2% of participants. The Turkish AS-20 demonstrated good internal consistency, with a total Cronbach's alpha of 0.874. The psychosocial subscale showed a Cronbach's alpha of 0.862, and the functional subscale demonstrated a Cronbach's alpha of 0.822, indicating good reliability. Test-retest reliability analysis demonstrated excellent temporal stability for the psychosocial subscale, the functional subscale, and the total score (p<0.001).

CONCLUSION

The Turkish version of the AS-20 is a reliable and valid instrument for assessing strabismus-specific quality of life, demonstrating good internal consistency, high temporal stability, and applicability in both clinical practice and research settings.