If I want to trace the path of a circle with my eyes, I can do it in a counter clockwise direction easily, but they just won’t swivel in a clockwise direction - it’s more like a seris of disjointed jerks. Is this normal? Or have I got a weird eye diorder?
I dare you to go to an optometrist with that condition!
My bet is that if you practiced it, you would be able to trace a circle with your eyes in either direction.
There are a lot of little problems that can occur with your eye muscles. I wouldn’t sweat it unless it affected your vision, but if you’re concerned you can go get an eye exam. They don’t hurt.
WAG, are you right or left handed? Muscle control will be better depending on your handed-ness, which is evident in the direction of rotation. You might also try varying your speed, maybe your muscles can’t keep up at certain speeds.
Of course, this doesn’t negate the possibility of a ‘weird eye diorder’, whatever that is. 
–Tim
This sounds quite normal to me; it’s nigh-on impossible to move your eyes smoothly, except when actually following a moving object,the focus of attention tends to move jerkily anyway; there’s no real advantage to having eyes that move slowly, so nature has designed them to dart about.
I was just wondering, when you are tracing these circles, are you just following an imaginary circle in the air or are you following something (like a cursor or someone’s finger, etc)? Does it make a difference if you have something to follow?
and what about your side to side eye movement?