设计单一洞使你在轻织物上缝合平直缝针没有偏差。
Designed with single hole to allow you to sew a straight stitch on lightweight fabric without skipping stitches.
介绍了用于压平眼压计的圆台压平棱镜进行角膜压平直径线性测量原理及定位偏差分析；
The linear measurement principle of flattened diameter of the ocular cornea and the location deviation of the cone prism which is used in the applanation tonometer are introduced.
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