at the start it seemed to be rippling a little. i've seen this a bit lately. after that, a few of the usual things happened, like glowing on one side, getting darker then lighter. then i got the black circle in the middle of my vision happening. nothing unusual there. i stayed with that for a long time. eventually it spread so that it covered almost everything. there was a sort of green glow to the outline of things which would come and go, but the blackness was very expansive. i could see my dog lying near my feet and other things in the periphery, so don't worry, i didn't just have my eyes closed!
after watching this for ages, i got a sudden return of regular vision and realised my eyes were wildly cross-eyed. like the two images of my kasina were a couple of feet apart.
Access concentration moving towards 1st jhana but not getting there yet.
i know jhana states have a relationship with eye focus / being cross eyed and stuff. and i seem to mess with that a bit even when my eyes are shut. no wonder my eyes are so sore...
That's partly true but you don't need to do anything with your eyes to go into jhana, the connection between the two is the natural position the eyes take when you go into jhana but it's not something you need to work on right now. Just stay with your object, nothing more fancy or complex than this.
anyway, i shut my sore eyes, and kept going. eventually i felt a kind of pressure on and in my forehead. i've had that before. then it felt like there was a block of wood kind of holding up my cheekbones and eyes. eventually quite a lot of the whole outside of my head (internally a bit but not really inside) felt like it was wooden.
Overexertion. Take it easy, relax and hold your object like you'd hold a baby; gently but firmly enough that you won't drop it.
When your kasina begins to visually shift around and move, close your eyes and bring up the afterimage of it then focus on that.