Abstract
Purpose :
Refractive error is associated with binocular vision dysfunctions. Although the myopia rate of young adults in Taiwan has already reached nearly 90%1, the prevalence of binocular vision dysfunctions in Taiwan is still unclear. Thus, the purpose of this study is to investigate the prevalence of binocular vision dysfunctions in non-presbyopia adults in Taiwan.
Methods :
A total of 107 healthy non-presbyopia adults aged between 20 to 40 years old were included in this study. All participants were corrected refractive errors and examined accommodative tests and binocular vision tests. The collected data were analyzed and categorized into 7 types of vergence dysfunctions and 2 types of accommodative dysfunctions by using the diagnostic criteria of Ma et el.2
Results :
The results showed that 48.6% of all participants were normal binocular vision and 51.4% were abnormal binocular vision (including vergence dysfunctions and accommodative dysfunctions). In the vergence dysfunctions, there were 15.0% were basic exophoria (BXO), 8.4% were convergence insufficiency (CI), 5.6% were divergence insufficiency (DI), 3.7% were fusional vergence dysfunction (FVD), 2.8% were basic esophoria (BSO), 1.9% were convergence excess (CE), and 1.9% were divergence excess (DE). In the accommodative dysfunctions, there were 8.4% were accommodative insufficiency (AI) and 3.7% were accommodative infacility (AIF).
Conclusions :
In conclusions, this study indicated that 39.3% of the participants were vergence dysfunctions and 12.1% were accommodative dysfunctions. BXO and AI is the most common type in vergence dysfunctions and accommodative dysfunctions, respectively.
1. Ophthalmology, 2021, 128(2): 290-301.
2. J Ophthalmol, 2019, 5904903.
This abstract was presented at the 2022 ARVO Annual Meeting, held in Denver, CO, May 1-4, 2022, and virtually.