Matthew Poole and continuators on Job 17:5

5. He that speaketh Flattery to his Friends , even the Eyes of his Children shall fail .

Hereby Iob chargeth them either 1. With flattering him with vain hopes, and Promises of the return of his former prosperity, when he knew that his case was desperate. Or 2. With flattering and befriending God, and giving a partial sentence out of respect to him; for which he reproved and condemned them before, Ch. 13. 7, 8, 9. where see the notes. Some render the words thus, He that uttereth, or declareth his mind or thoughts (as this word signifies, Psal. 139. 2, 17. with flattery, or to flatter or deceive another.

He shall be severely punished, not only in his Person, but even in his Children, whose Eyes shall fail with vain expectations of Relief and deliverance out of those Calamities, which shall come upon them for this sin of their Parents.