E3S Web of Conferences

Design and Research of Handheld Automatic Refractor

Changfu Zhao, Hongchang Ding, Guohua Cao and Han Hou

E3S Web Conf., 252 (2021) 02006

Published online: 23 April 2021

DOI: 10.1051/e3sconf/202125202006

Changfu Zhao

Hongchang Ding

Guohua Cao

Han Hou

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