optical /ˈɑːptɪkəl/ adjective Learner's definition of OPTICAL
technical
1
: used to help a person see有助于视力的 2
: relating to or using light光的;用光的 3
: involving the use of devices that get information for a computer by identifying patterns of light光学识别的 — optically
/ˈɑːptɪkli/ adverb