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The Prevalence and Related Factors of Non-Strabismic Binocular Vision Dysfunction in An Optometry Clinic in Northeastern Sichuan |
Yang Liu, Qingqing Tan, Xuan Liao, Yumei Mao, Changjun Lan |
Department of Ophthalmology, Affiliated Hospital of North Sichuan Medical College; Department of Ophthalmology & Optometry, North Sichuan Medical College, Nanchong 637000, China |
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Abstract Objective: To investigate the prevalence and related factors of non-strabismic binocular vision dysfunction (NSBVD) in patients aged 12 to 35 years in an optometry clinic in northeastern Sichuan. Methods: In a consecutive case series study, 172 volunteers aged 12 to 35 years who sought routine visual examinations in our optometry clinic were recruited. Outcome measurements included subjective refraction, stereopsis, horizontal heterophoria, positive fusional vergence (PFV), negative fusional vergence (NFV), vergence facility (VF), near point of convergence (NPC), monocular accommodative amplitude (MAA), monocular accommodative facility (MAF), monocular estimated method retinoscopy (MEM), and a convergence insufficiency symptom survey (CISS). Based on the measurement results, the prevalence of each classification diagnosis of NSBVD was calculated; correlation analysis and logistic regression analysis were used to analyze the related factors of NSBVD. Results: NSBVD accounted for 36.1% of the sample, of which convergence insufficiency was the most common type, with a prevalence of 12.8%. Logistic regression analysis did not show significant associations between the occurrence of NSBVD and gender, age, spherical equivalent (SE), or interocular SE differences. No significant correlation was found between the binocular SE difference and any binocular vision measures. However, a significant negative correlation was found between the SE and distance PFV (r=-0.243, P=0.010), distance NFV (r=-0.247, P=0.009) and CISS score (r=-0.211, P=0.027), and a significant positive correlation was found with NPC (r=0.224, P=0.019). Conclusions: NSBVD is prevalent in people aged 12 to 35 years in the optometry clinic. Age, gender and refractive status are not risk factors for NSBVD. However, several binocular vision measures are associated with the degree of myopia. With the increase in the degree of myopia, the distance fusional vergence ranges increase, the NPC recedes, and the CISS score increases.
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Received: 01 December 2020
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Fund: Key Project of Health Commission of Sichuan Province (18ZD022); Key Project of Nanchong City and University Cooperation (18SXHZ0492); Nanchong City and University Cooperation Project (19SXHZ0069); Project of North Sichuan Medical College (CBY20-QA-Y25) |
Corresponding Authors:
Changjun Lan, Department of Ophthalmology, Affiliated Hospital of North Sichuan Medical College; Department of Ophthalmology & Optometry, North Sichuan Medical College, Nanchong 637000, China (Email: lanchangjun@sina.com)
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