Jamieson, Fausset and Brown on Isaiah 29:10

10. Jehovah gives them up judicially to their own hardness of heart (compare Zec 14:13). Quoted by Paul, with variations from the Septuagint, Ro 11:8. See Is 6:10; Psa 69:23.

eyes; the prophets, &c.--rather, "hath closed your eyes, the prophets; and your heads (Margin; see also Is 3:2), the seers, He hath covered." The Orientals cover the head to sleep; thus "covered" is parallel to "closed your eyes" (Jud 4:19). Covering the face was also preparatory to execution (Es 7:8). This cannot apply to the time when Isaiah himself prophesied, but to subsequent times.