ĐẶC ĐIỂM LÂM SÀNG LÁC NGOÀI TỪNG LÚC CÓ ĐỘ LÁC NHỎ

Abstract

Objctive: To describe the clinical characteristics of intermittent exotropia with small deviation. Subjects and Methods: A cross-sectional descriptive study was conducted on 32 patients with intermittent exotropia examined at the Vietnam National Eye Hospital from May 2025 to September 2025. Results: 32 patients participated with a male-to-female ratio of 59,4% to 40,6% and an average age of 9,12 ± 3,1 years. Twenty-four patients (75%) presented with exotropia before the age of 6 and 28,1% showed progression over time. Refractive errors were present in 78,1% of eyes, with myopia being the most common (54.7%). Visual acuity improved significantly after refractive correction. The mean distance deviation was 16,66 ± 4,09PD, and the mean near deviation was 15,50 ± 4,38PD. The basic type of intermittent exotropia accounted for the highest proportion (87.5%), followed by divergence excess types (12,5%). The mean Newcastle Control Score was 3,94 ± 0,95 with 28.1% of patients having good control and 71,9% having fair control. All patients (100%) had binocular vision, among whom 28 patients (87,5%) demonstrated stereopsis with a mean stereopsis of 153,93 ± 153,003 arc-seconds. Conclusions: Intermittent exotropia most commonly begins before 6 years of age. The basic type predominates. Binocular vision is generally present but varies in quality among patients.