You know, we just got done with our opthalmology mini-sequence, so I know more about eye movements than any normal preson really ever should (not that I'm accusing myself of being normal, mind you
![[Razz]](images/icons/tongue.gif)
).
Here are some fun facts:
There are four basic types of eye movements:
1) Vestibulo-ocular: This is what keeps your eyes pointing the same direction when your head moves. Try looking at a spot across the room and shaking your head back and forth slowly. Now speed up and see how vigorously you have to shake your head before the image starts to jerk around. This is an especially useful reflex to have when you are driving or otherwise moving around.
2) Saccadic: This is how your eyes move when you are looking at one target and then want to shift your attention to another target. Your eyes jump to the new target. Also, as a function of the vestibulo-ocular reflex, as you turn your head, your eyes fixate on a single point. Once your head has turned past the point where your eyes can fixate, your eyes will jump back to center and you will fixate on another point and repeat the process.
3) Accommodation: Try this one on a friend. Have your friend follow your finger with his or her eyes while holding his or her head still. Then put your finger right in front of their face and move it inwards (towards their nose). The eyes will converge (point towards each-other) and the pupils will constrict. Accommodation is used to switch between targets at different distances.
4) Pursuit: Pursuit is when you follow a moving target with your eyes. In this type of movement, the eyes move smoothly and consensually (together). Most people find it difficult, if not impossible, to use pursuit movements without a target to follow.