1)
Why does it say "va'Y'ireni"?
1.
Radak: Regarding other visions, it says "v'Esa Einai" (2:1) ? he saw on his own. Here, the angel aroused him to see it.
2.
Malbim: The Navi did not understand the previous vision ? carving the seven eyes. Therefore he fell asleep ? this is when Devar Hashem is covered from him. Therefore the angel woke him and showed to him another vision to explain the first.
2)
What is the tense of "Ye'or?
1.
Radak: It is Nif'al conjugation. He aroused me, and I was aroused like one who awakens from sleep.