dioptrical sight
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dioptrical — adjective /daɪˈɒptrɪkəl/ Acting as a medium for sight; making use of refraction (of lenses etc.). , 1759: had the said glass been there set up, nothing more would have been wanting, in order to have taken a mans character, but to have taken a… … Wiktionary
dioptric — [dī äp′trik] adj. [Gr dioptrikos, relating to the DIOPTER] 1. of optical lenses or the method of numbering them according to their refractive powers; dioptral 2. of dioptrics; refractive 3. helping the sight by refractive correction: Also… … English World dictionary