Albert Barnes Commentary Job 17:7

"Mine eye also is dim by reason of sorrow, And all my members are as a shadow." — Job 17:7 (ASV)

Mine eye is dim by reason of sorrow - Schultens supposes that this refers to his external appearance in general, as being worn down, exhausted, “defaced” by his many troubles; but it seems rather to mean that his eyes failed on account of weeping.

And all my members are as a shadow - “I am a mere skeleton, I am exhausted and emaciated by my sufferings.” It is common to speak of persons who are emaciated by sickness or famine as mere shadows. Thus, Livy (L. 21:40) says, Effigies, imo, “umbrce hominum”; fame, frigore, illuvie, squalore enecti, contusi, debilitati inter saxa rupesque. So Aeschylus calls Oedipus - Οἰδίπου σκιαν Oidipou skian - the shadow of Oedipus.