The doctor may choose to use an automated instrument that automatically evaluates the focusing power of the eye.
医生会使用一种自动化的仪器来检测出眼球聚焦光线的能力。
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Focusing eyepiece provides a sharp, easy-to-read scale, which is designed with semi-transparent blue background so you don't have to point the instrument in a certain direction to get your reading.
The principle, constitution, main technical parameters, instrument features and its application of a novel TV interior focusing and centering instrument are introduced in the paper.