This idiom means the writer has cried so much that his eyes do not see well any longer. AT: "my eyes are swollen from tears" (See: [[rc://en/ta/man/translate/figs-idiom]])
This is an exaggeration to express how many enemies the writer has. AT: "more than I can count, like the hairs on my head" (See: [[rc://en/ta/man/translate/figs-hyperbole]])