The proverbial phrase which provides the present headword is employed in Aristophanes, Plutus [Wealth] 210, the scholia to which are drawn upon here; cf. also Aristophanes fr.260.
[1] The sons of Aphareus (cousins of Kastor and Polydeukes, the Dioskouroi).
[2] This is a different Lynkeus, king of Argos [Myth, Place] (Pindar, Nemean 10.12: web address 1) and husband of Hypermnestra, who spares him when she and her sister Danaids (daughters of Danaos) are instructed to kill their husbands (all sons of Aigyptos) by their father. Cf. ps.-Apollodorus, Bibliotheca 2.1.5 (web address 2).
[3] His sharp sight becomes proverbial, as in the headword phrase. Cf. Appendix Proverbiorum 3.71.2 *Lugke/ws o)cu/teron ble/pei ["he sees more acutely than Lynkeus"].
[4] This is odd. Pindar in Nemean 10.60ff. (web address 1) tells of Idas killing Kastor after Lynkeus has seen Kastor (and possibly Polydeukes: text and interpretation uncertain, cf. the scholia to Pindar, Nemean 10.114a) hiding in an oak. Kypria F15 Bernabé has Lynkeus see both Kastor and Polydeukes hiding in an oak, while the summary of the Kypria in Proclus, Chrestomathy 108ff. also has Idas kill Kastor. Although Kastor kills Lynkeus in Theocritus, Idylls 22.193ff., there is no mention of Lynkeus seeing through a tree. Should the aorist participle dolofonh/santa be emended to the future dolofonh/sonta ["intending/about to murder treacherously"]? This would tally with the version in the scholia to Pindar, Nemean 10.114b -- where Lynkeus sees Kastor waiting in ambush for Idas, and tells Idas, who wounds Kastor with a spear -- and ps.-Apollodorus, Bibliotheca 3.11.2 (web address 3) where Lynkeus sees Kastor and Polydeukes waiting in ambush, and tells Idas, who kills Kastor.
[5] Apollonius Rhodius, Argonautica 1.154-5.