noun
discerning person; person of insight
A formal, literary term for someone with keen judgment or deep understanding, especially in artistic or intellectual matters. Rare in modern conversation.
彼は美術の世界では具眼の士として知られている。
He is known as a discerning person in the art world.
この批評は、まさに具眼の士の言葉だ。
This critique is truly the words of a person of insight.
鑑識眼 refers to the discerning eye itself (the ability), whereas 具眼の士 refers to the person who possesses it.
A Sino-Japanese compound: 具眼 (having a discerning eye) + の (possessive particle) + 士 (person of standing). The exact historical derivation is uncertain, but it follows classical Chinese-influenced word formation.