orthoscope e直光镜;水检眼镜
orthoscope eyepiece无畸变目镜
orthoscope optical system无畸变光学系统;正像计
orthoscope eye-piece无畸变目镜
N(名词) 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]