虹膜

例句：

1. 1. The iris of the eye is responsible for filtering light and color.
   眼睛的虹膜负责过滤光线和颜色。
2. 2. She had a rare condition that affected her iris.
   她患有一种罕见的疾病，影响了她的虹膜。
3. 3. The doctor examined her eyes to check for any abnormalities in the iris.
   医生检查了她的眼睛，以检查虹膜是否有任何异常。