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目的：运用Ｓｈｅａｒｄ 准则和Ｐｅｒｃｉｖａｌ 准则对近阅读视疲劳等双眼视失平衡症状进行评估，从而探讨Ｓｈｅａｒｄ 准则和Ｐｅｒｃｉｖａｌ 准则的显著性和特异性及其临床意义。方法：对５３ 位大学生进行眼屈光检查，同时检测远近分离性隐斜，远近辐辏，正相对调节，负相对调节，辐辏近点，调节幅度等眼动参数并以问卷形式搜集个体的双眼视症状。计算ＡＣ／Ａ参数，绘制每个个体的双眼单视清晰区并检测其对Ｓｈｅａｒｄ 准则和Ｐｅｒｃｉｖａｌ 准则的符合性。结果：Ｓｈｅａｒｄ 准则对双眼视症状的显著性为８０％ ，特异性为５９％ ，而Ｐｅｒｃｉｖａｌ 准则对双眼视症状的显著性为５０％ ，特异性为７７％ 。结论：Ｓｈｅａｒｄ 准则和Ｐｅｒｃｉｖａｌ 准则为评价双眼水平位均衡的有效方法。Ｓｈｅａｒｄ 准则有高度的显著性，特别对于外隐斜者；而ｐｅｒｃｉｖａｌ 准则有较高的特异性。
OBJECTIVE: To evaluate the significance of the Sheard criterion and Percival criterion and their clinical significance by using Sheard criterion and Percival criterion to evaluate the binocular imbalance symptoms such as near reading fatigue. Methods: Fifty-three undergraduate students were examined by ocular refractive examination, meanwhile, distance-dependent phoria, near and far convergence, positive relative regulation, negative relative regulation, convergence point and convergence rate were detected and binocular vision was collected by questionnaire symptom. The AC / A parameters were calculated, binocular clarity was measured for each individual and their compliance with Sheard criteria and Percival criteria was tested. Results: The Sheard criterion was 80% significant and 59% specific to binocular vision. The Percival criterion was 50% significant and binocular with a specificity of 77% for binocular vision. Conclusion: The Sheard criterion and Percival criterion are effective methods to evaluate the binocular level equilibrium. The Sheard criterion is highly significant, especially for extraverted subjects; whereas the percival criterion has a high specificity.