目前，国内外在单株立木直径测量过程中，主要使用的还是需人工读取和记录测量数据的测径围尺或轮尺等树木测量工具。

Presently in standing tree's diameter measuring process, the main tools are tape meter or caliper, which need manpower to read and record measure data.

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能使用测径规，千分尺，测量仪表，轮廓测定投影器，块规。

Ability to use Callipers, Micrometers, Gauges, Profile Projector, Gauge Block.

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方法：所有穿透性角膜移植术的角膜白斑病例术前测微尺测量角膜白斑的长径与短径。

Methods:All the corneal leucoma cases were chosen suing Micrometer preoperatively to measure the diameter of the corneal leucoma and the whole corneal.

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