1
enlightenment;spiritual awakening;opening one's eyes to the truth
esp. かいげん
2
reaching one's peak (as a performer, etc.);reaching the highest echelons
esp. かいげん
3
only applies to
かいがん
gaining eyesight;restoring eyesight;opening the eyes
4
only applies to
かいげん
filling out the eyes (of a Buddha) as the last step of consecrating a new statue or picture;ceremony where a newly made image or idol is consecrated