i-adjective
sharp-eyed; quick to notice
Describes someone who notices things quickly or has keen observation. Often used for people who spot details or changes immediately.
彼は目早いから、小さなミスもすぐ見つける。
He is sharp-eyed, so he quickly spots even small mistakes.
目早い人なら、この違いに気づくはずだ。
A sharp-eyed person would notice this difference.
目ざとい is a more common synonym with the same meaning of 'sharp-eyed' or 'quick to notice'. 目早い is less frequent but carries a similar nuance.
Compound of 目 (eye) and 早い (fast, quick). The exact historical derivation is uncertain, but the meaning is transparent from its components.