Background To evaluate binocular summation ratio using contrast sensitivity (CS) testing and correlation between binocular summation and stereoacuity, and control scale in intermittent exotropia (IXT). Methods We conducted a prospective case-control study. Thirty-seven IXT and 41 controls were evaluated with both monocular and binocular CS testing. We compared the binocular summation ratio of IXT to that of controls. Near and distance stereoacuity was assessed and office-based control scale was evaluated. We investigated correlation between binocular CS summation ratio and stereoacuity, and control scale in IXT, respectively. Results IXT had lower binocular CS summation ratio than controls at 1.5 and 3.0 cycles/degree (1.01 ± 1.02 vs. 1.62 ± 1.88 and 1.17 ± 0.96 vs. 1.86 ± 1.75, Both P Conclusion Our findings of subnormal binocular CS summation ratio in IXT had correlation with stereoacuity and control scale suggest that binocular CS testing may be a useful method in assessing binocular visual function in IXT. Go to: Graphical Abstract
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机译：背景技术使用对比敏感度（CS）测试以及双眼求和与立体视之间的相关性以及间歇性外斜视（IXT）的控制量表来评估双眼求和比率。方法我们进行了一项前瞻性病例对照研究。通过单眼和双眼CS测试评估了37个IXT和41个对照。我们将IXT的双目总和与对照组进行了比较。评估近距离和远距离立体视力，并评估基于办公室的控制量表。我们分别研究了双眼CS总和与立体视之间的相关性以及IXT中的控制量表。结果IXT在1.5和3.0个周期/度时的双眼CS总和率低于对照组（1.01±1.02 vs. 1.62±1.88和1.17±0.96 vs. 1.86±1.75，两者P结论与立体视力和控制量表的相关性表明，双眼CS测试可能是评估IXT中双眼视觉功能的有用方法。
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