Answer:
Those eyes of yours, which now can see so clearly, will be dark
Step-by-step explanation:
The statement was made by Teiresas, a Theban prophets who stays in the underworld, among many of his project to Oedipus, is that Oedipus' parents curse will someday drives him out of the land, he went futher to prohecy that, Oedipus will someday go blind, by saying "Those eyes of yours, which now can see so clearly, will be dark."
Hence, the line "Those eyes of yours, which now can see so clearly, will be dark." foreshadowed Oedipus eventual blindness.