視力

1. Origins, structure, and basic meaning

• Structure: 視力 is read as しりょく and means eyesight or the ability to see and distinguish objects.
• Basic usage: It can be the ability being tested or vision that temporarily seems worse in a dark place.

2. Common pitfalls and similar expressions

• As the object of a test
  • 視力を調べてもらう means having someone test one's eyesight. Example: 教室の後ろから文字が見えず、視力を調べてもらった。
• A perceived temporary change
  • 視力が落ちたように感じる reports the feeling that vision has worsened rather than confirming a lasting decline. Example: 暗い場所では一時的に視力が落ちたように感じる。