noun
artificial eye; glass eye; prosthetic eye
Refers to a prosthetic eye, typically made of glass or plastic, used after eye loss.
事故で片目を失い、入れ目を入れている。
He lost one eye in an accident and now wears an artificial eye.
義眼 is a more formal, medical term for 'artificial eye' or 'ocular prosthesis', while 入れ目 is a common, everyday word.
Compound of 入れ (ire, 'putting in') + 目 (me, 'eye'), literally 'inserted eye'.