IPA: /daɪˈɒptrɪk/
KK: /daɪˈɒptrɪk/
Related to the bending of light to help with vision or optics.
The dioptric properties of the lens improve the clarity of the image.
Dioptric → It is formed from "di-" (meaning through or across) and "optrikos" (from Greek "optikos", meaning of sight or vision). The word "dioptric" refers to the measurement of the refraction of light through lenses, thus relating to vision through lenses.
Think of light traveling 'through' ('di-') lenses that help us see better, which is what dioptric relates to.