I do a lot of work on the computer. A couple of times, while working, it seemed as if the vision in one eye blacked out and then I was seeing wavy colorful shapes in front of the eye. while this was happening, it was difficult to see anything out of the eye. I then have a slight headache after. I just forced myself to work through it both times until the vision returned to normal. Can you give me any idea what may cause this. I do seem to have a chronic sinus and ear condition - both are plugged up most of the time, and (I don t remember the last time this happened) but today I seemed to have a lot of sinus pressure when it happened.