‘睛明’ is an adjective meaning 'keen-sighted' or 'clear-eyed', describing sharp, healthy vision—especially eyes that are bright, alert, and free from cloudiness or fatigue. The character 睛 (jīng) refers specifically to the eyeball or pupil, while 明 (míng) means 'bright', 'clear', or 'intelligent'; together, they evoke the image of luminous, perceptive eyes that reflect mental and physical vitality.

This term is used primarily in formal, literary, or medical contexts—not in casual daily speech. It often appears in classical poetry, traditional Chinese medicine texts (where eye clarity signals liver health), or descriptions of animals or people with exceptionally vivid, penetrating gaze. While it can describe actual visual acuity, it more frequently conveys a holistic impression: brightness of expression, alertness, and inner clarity reflected outwardly through the eyes.