optical illusion

名词 optical illusion:

1. an optical phenomenon that results in a false or deceptive visual impression

1. I thought I saw a ghost but it was just an optical illusion.
   我以为我看见鬼了，其实只是一种幻觉。
2. A mirage is an optical illusion.
   海市蜃楼是一种视错觉。