瞳ひとみを凝こらす

expression, godan verb (-su)

strain one's eyes; stare intently

Used when focusing one's gaze sharply, often to see something small, distant, or unclear. Similar to 目を凝らす but with a slightly more literary or poetic feel due to 瞳.

See also: 目を凝らす

• 暗くら闇やみに瞳ひとみを凝こらして、何なにか動うごくものがないか探さがした。

  I strained my eyes in the darkness, searching for anything moving.

• 彼かれは遠とおくの船ふねを確たしかめようと、瞳ひとみを凝こらした。

  He stared intently, trying to make out the distant ship.