It's pretty normal for wen to grow bigger as the oranda ages. In your case, you will probably have to consider trimming the wen or (bubbly growth bit on its forehead) back a bit so it can see normally again.
There are no nerve endings in the wen and no bleeding from trimming it. It's somewhat like people getting a haircut.
Here's a video showing the procedure and what's involved in trimming the wen back.
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