R.D.
Yeah, you're probably going to die in the next 30 minutes.
I'm kidding.
My eye or lip gets twitchy when I'm under serious stress and feeling overwhelmed. Yes, when my eye twitches, it can cause some blurriness. Sitting in front of the computer all day also wreaks havoc on your eyes. They make yellow tinted glasses to wear when you're in front of the computer all the time, they help a lot.
Signs of a stroke:
sudden numbness/weakness on one side
sudden having trouble speaking
sudden severe headache
sudden change in vision (would not come and go, like you described)
sudden difficulty in walking