noun
artificial eye; glass eye; ocular prosthesis
Medical and everyday term for a prosthetic eye. Often used in contexts of eye loss or replacement.
事故で片目を失い、義眼を入れている。
I lost one eye in an accident and now have an artificial eye.
彼は義眼だと気づかれないほど自然だ。
His artificial eye is so natural that nobody notices.
Compound of 義 (artificial, substitute) and 眼 (eye). The exact historical origin is uncertain, but the term follows the pattern of other prosthetic terms like 義手 and 義足.