虹彩

1. Origins, structure, and basic meaning

• Structure: 虹彩 is read as こうさい and is a noun for the iris, the colored ring-shaped part surrounding the pupil of an eye.
• Basic usage: Anatomical location appears in 虹彩の位置, while reflected light appears in 虹彩に映る光.

2. Common pitfalls and similar expressions

• Difference from 瞳孔
  • 虹彩 is the colored ring, while 瞳孔 is the dark opening at its center.
• Location of reflected light
  • The に in 虹彩に映る光 marks the place where the light appears reflected.