optical
/ˈɔptɪkl; `ɑptɪkl/ adj[esp attrib尤作定语]
1 of the sense of sight 视觉的; 视力的
optical effects and sound effects 视觉效果与声音效果.
2 for looking through; to help the eyes 供视力透过的; 有助於眼睛的
optical instruments, eg microscopes and telescopes 光学仪器（如显微镜和望远镜）.