When tired and it was dark, I noticed that if I focused on a dim light source and moved my eyes fairly rapidly sideways, the resulting images that lingered for a short while were not smoothly blurred together, but were discrete.
I assume this is not due to the brain's inability to process the data fast enough or the retinas not repairing fast enough when light breaks part of them down, so I am lead to the conclusion that eyes (if not generally, sometimes) move in very small sudden jolts rather than smoothly.
Is this correct? What is the reason for this (is it due to the eye muscles being unable to sustain motion for a long time, or something to do with the mechanics of the eye)? Was this result anomalous?