error in examination
检查错误
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Methods Infrared and vernier means were used in the examination of dark focus. The stability, relationship between dark focus and refractive error were studied.
方法：主要用激光散斑法和游标法进行暗焦点检查，并在与屈光不正的关系及仪器的稳定性进行了应用研究。
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