This phrase refers to those who worship these idols and who claim to be witnesses of the idols' power. Yahweh speaks of their inability to understand the truth as if they were blind. Alternate translation: "those who serve as witnesses for these idols are like blind people who know nothing" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This can be stated in active form. Alternate translation: "they will be ashamed" or "their idols will put them to shame" (See: [[rc://en/ta/man/translate/figs-activepassive]])