IPA: /ˈɒptɪsɪst/
KK: /ˈɑptɪsɪst/
A person who studies or works with light and vision, especially in relation to lenses and optical instruments.
The opticist explained how different lenses can affect our vision.
Opticist → It is formed from "optic" (from Greek "optikos", meaning of or relating to sight) and "-ist" (meaning one who practices or is concerned with). An opticist is someone who specializes in or practices in the field of vision or optics.
Think of someone who is concerned with 'sight' ('optic') and practices in that field ('-ist'). This helps you remember that an opticist is a specialist in vision.