Since end of April of 2016, I've been experiencing weird vision symptoms such as distortion. Lately, I've developed a new symptom where I would experience a split-second blackout in vision without consciousness. I've seen a eye specialist, glaucoma specialist, and retina specialist, where they all ruled out negative for eye disease except that I've pigment dispersion syndrome that is not yet leading to glaucoma. Aside of all this, I'm going for a MRI Scan soon and I'm just wondering if I may have a brain tumour that is causing these symptoms?