Convergence insufficiency (CI) is a dysfunction of binocular vision that is associated with various signs and symptoms in near work. However, CI screening is performed less frequently in adults than in children. We aimed to evaluate the ability of screening tests to discriminate CI from other binocular vision anomalies and normal binocular vision in young adults. One hundred eighty-four university students (age, 18-28 years) who underwent an eye examination due to ocular discomfort were included. Near point of convergence (NPC), phoria, accommodative amplitude, fusional vergence, the ratio of accommodative convergence to accommodation, relative accommodation, binocular accommodative facility, vergence facility, and the values corresponding to Sheard's and Percival's criteria were evaluated. Receiver operating characteristic (ROC) curve analysis for each test was also performed. The prevalence of CI ranged from 10.3% to 21.2%, depending on the signs and the presence of CI associated with accommodative disorders. Assessments based on NPC, Sheard's criterion, and Percival's criterion showed high discriminative ability, with the ability being higher between the CI and normal binocular vision groups than between the CI and non-CI groups. Sheard's criterion showed the highest diagnostic performance in discriminating CI with three signs from the non-CI group. The cut-off values were 7.2 cm for NPC, -0.23 to 1.00 for Sheard's criterion, and -4.00 to -2.33 for Percival's criterion. Our results suggest that the use of Sheard's criterion with NPC shows high performance for screening of CI.

中文翻译：

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接收者操作特征曲线分析的临床体征，用于筛查年轻成年人的收敛不足。

会聚不足（CI）是双眼视觉功能障碍，与附近工作时的各种体征和症状有关。但是，成人的CI筛查比儿童少。我们旨在评估筛查测试将CI与其他双眼视力异常和正常成年人的双眼视力区别开来的能力。包括因眼部不适而接受眼科检查的84名大学生（年龄在18-28岁之间）。评估了近会聚点（NPC），隐斜率，适应性振幅，融合融合，适应性融合与适应的比率，相对适应性，双目适应性设施，融合性以及与Sheard和Percival标准相对应的值。还对每个测试进行了接收器工作特性（ROC）曲线分析。CI的发生率在10.3％至21.2％之间，具体取决于体征和与调节性疾病相关的CI的存在。基于NPC，Sheard准则和Percival准则的评估显示出较高的区分能力，CI和正常双目视觉组之间的区分能力高于CI和非CI组。Sheard的标准显示出以非CI组的三个体征区分CI的最高诊断性能。NPC的临界值为7.2 cm，Sheard准则的临界值为-0.23至1.00，Percival准则的临界值为-4.00至-2.33。我们的结果表明，将Sheard准则与NPC结合使用可显示出CI筛选的高性能。