Just did the finger test you described and . . .
To the right – upon reaching 2/3 of the way towards the extremes my eyeballs start to wobble badly! It’s very difficult keeping my eyes on the finger (and I start to feel ill). I cannot track it any further. As I bring the finger (and therefore my eyes) back towards the middle, the wobbling stops and all goes back to normal. Any ideas what’s causing this ?
Looking to the left, I cannot track my finger the whole way, only about 3/5 of the way, although I can see my finger travel the rest of the way in my peripheral vision, is that normal ?