Line gauge: Measuring ruler used for copy fitting and measuring type.
行数尺：量度字体大小和配稿用尺。
Line gauge: Measuring ruler used for copyfitting and measuring type. Also called Type gauge.
行数尺：量度字体大小和配稿用尺。亦称字尺。
The objective is to investigate difference of metric ruler, videorefactor and pupillometer in measuring pupillary distance (PD).
目的是研究度量尺，视频重构和瞳孔计在测量瞳孔距离（PD）方面的差异。
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