[字辨] illusion / delusion 如何分辨

[asasasas (asasasas)]

(    )When a thirsty traveler sees a non-existing pool of water in the

     desert, he is having an optical _______.


這題答案給illusion

可是選項有delusion

我查字典這兩個字都有迷惑 錯覺的意思  字典還把他們列為同義字

請問到底該如何分辨?

謝謝

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◆ From: 123.241.4.173
推 anjohn:用英英字典a mental condition in which you believe
→ anjohn:things that are not true << delusion
→ anjohn:an appearance or effect that is different from the way
→ anjohn:that things really are << illusion
→ anjohn:所以就知道答案是illusion
推 kurage306:illusion->got confused cuz ur brain's being tricked
→ kurage306:delusion->psychoatic sickness making u believe what
→ kurage306:is not true in the reality.
推 sunycat:用醫學角度回答 illusion是錯覺 有接受刺激才會產生
→ sunycat:delusion是妄想 有無中生有的感覺
推 ggirls:delusion是有精神病，illusion則是每個人都有可能發生。
→ riopotter:optical illusion是固定說法  是搭配詞(collocation)的
→ riopotter:問題