orthoscope optical system 无畸变光学系统 ; 正像计
orthoscope e 直光镜 ; 水检眼镜
orthoscope eyepiece 无畸变目镜
orthoscope eye-piece 无畸变目镜
N a 19th-century instrument for viewing the fundus of the eye through a layer of water, which eliminates distortion caused by the cornea 水检眼镜 [医学] [OBSOLETE]
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