What could cause this and should i visit the hospital? a few hours ago i had a brief flash of black lines shoot across my vision, my eye began to twitch and it looked like blood filled up in the corner of the eye. the red has now vanished from my eye and

Visual : Visual disturbance can arise in the eye, in the optic nerve, or in the visual cortex of the brain. Sudden visual loss suggests a temporary loss of blood flow or abnormal electrical impulses (that is seizure-type activity). The fact that you saw externally visible changes to the eye itself and now have problems around the eye makes it more likely that this is a local issue than a brain issue. That does not mean it should be ignored, though. I think you should go to the er and have your eye checked out. A delay in doing so could potentially result in a permanent injury.

Yes. : It could be a retinal detachment. You should see a retinal specialist or perhaps begin with a general ophthalmologist who can conduct a dilated retinal examination and determine the cause.