• 眼科がんか — ophthalmology
• 近眼きんがん — nearsightedness
• 遠眼えんがん — farsightedness
• 開眼かいがん — enlightenment; awakening
• 主眼しゅがん — main point; emphasis
• 眼力がんりき — sharp eyes; insight
• 着眼ちゃくがん — focus; attention
• 眼球がんきゅう — eyeball

The kanji 眼 combines the radical 目 (eye) with 艮, a component lending sound and nuance. It refers not only to the physical eye but also to perspective, perception, and insight in abstract contexts.