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Normative Data for Non-Strabismic Binocular Vision Parameters in a Nepalese Young Adults
Santosh Chhetri1, Rupesh Poudel1, Suraj Thapa Magar1
1Department of Optometry, Tilganga Institute of Ophthalmology, Kathmandu, Nepal.
Clinical Ophthalmology (Auckland, N.Z.)
|March 16, 2026
Summary
This study establishes normative data for non-strabismic binocular vision (NSBV) in Nepalese adults, finding age significantly impacts accommodation but gender has minimal effect. These findings aid in diagnosing and managing binocular vision disorders in South Asian populations.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Non-strabismic binocular vision (NSBV) parameters are crucial for visual function.
- Establishing population-specific normative data is essential for accurate diagnosis and management.
- Previous research has not comprehensively addressed NSBV norms in Nepalese young adults.
Purpose of the Study:
- To establish population-specific normative data for NSBV parameters in Nepalese young adults.
- To evaluate the association of these parameters with age and gender.
Main Methods:
- Cross-sectional analytical study of 1,393 asymptomatic adults aged 18-35 years.
- Comprehensive ophthalmic evaluation including standardized accommodative and binocular vision assessments.
- Statistical analysis using ANOVA and independent t-tests for intergroup comparisons.
Main Results:
- Normative values for key NSBV parameters were established (e.g., Amplitude of Accommodation: 8.75 ± 1.53 D).
- Amplitude of accommodation showed a strong negative association with age (R² = 0.85, p < 0.001).
- Statistically significant gender differences were observed but were not clinically meaningful.
Conclusions:
- This study provides the first large-scale normative dataset for NSBV in Nepalese young adults.
- Age significantly influences accommodative parameters, while gender differences are minimal.
- These population-specific norms support screening, diagnosis, and management of NSBVA in South Asian populations.
