1Examination by eye, or a type or instance of this (now rare).
2An assessment of eyesight or (in later use) any of various aspects of the function or health of the eye.
Mid 19th century.
英语词典包含464360条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。