Refraction - Using an instrument called a phoropter, your optometrist places a series of lenses in front of your eyes and measures how they focus light.
屈光状态检测——通过使用综合屈光检测仪，验光师将一套镜片放在眼镜的前面测量出眼球是如何聚焦光线的。
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Using an instrument called a phoropter, an optometrist places a series of lenses in front of your eyes and measures how they focus light using a hand held lighted instrument called a retinoscope.