late Middle English (in the sense ‘optics’): from medieval Latin perspectiva (ars) ‘(science of) optics’, from perspect- ‘looked at closely’, from the verb perspicere, from per- ‘through’ + specere ‘to look’
中世後期英語(「光学」の意):中世ラテン語 perspectiva (ars) '(science of) optics', from perspect- 'looked at closely', from the verb perspicere, from per- 'through' + specere 'to look'から。