Optical means 'about light, images, or the way we see,' especially when a machine or a process is doing the work.

Optical means 'about light, images, or the way we see,'意思是「跟光、影像，或我們看東西的方式有關」，especially when a machine or a process is doing the work尤其是當是機器或某個過程在做這件事的時候

An optical fibre is a thin glass thread that sends messages as light. An optical illusion is a picture or scene that tricks your eyes, so a straight line looks bent, or a still picture seems to move. An optical drive reads a disc with a laser.

An optical fibre一條光纖 is a thin glass thread that sends messages as light是一條細細的玻璃線，用光來傳送訊息。An optical illusion一個視覺錯覺 is a picture or scene that tricks your eyes是一張圖片或畫面騙過你的眼睛，so a straight line looks bent, or a still picture seems to move讓一條直線看起來是彎的，或一張靜止的圖看起來在動。An optical drive一台光碟機 reads a disc with a laser用雷射讀取光碟片

So optical is wider than optic: optic is mostly the eye itself; optical is light, images, and the tools we build around them.

So所以 optical is wider than opticoptical比optic範圍更廣：optic optic大多是指眼睛本身；optical optical是光、影像，以及我們圍繞它們做出來的工具

It is a school-and-science word. In casual talk people often just name the thing — a laser, a lens, a trick picture.

It它 is a school-and-science word是一個學校跟科學用的詞。In casual talk在隨性的對話裡 people often just name the thing人們常常直接講那個東西的名字──a laser雷射、a lens鏡片、a trick picture騙眼睛的圖片