I have been seeing blue dots and patches out of the corner of my vision for quite a while and am becoming worried as I have been to the opticians in that time and nothing special except a small prescription has been given which makes me worry about stuff like tumors. I have read in places an eye doctor would notice a tumor due to inter cranial pressure. Is this true? Really worried as I also sometimes get pressure headaches on the left side for example when I was ill my head would hurt when I coughed on the left and also 1 morning I woke up with a massive migraine but this has only happened once so I am not so worried about it.