How could you trace the patterns by looking at ones eye movements.  One does not even have to move their eyes at all for the patterns to be present or to observe them.  The patterns are w/in the field of vision, tracing them with your eyes and recording the eye movements would be difficult and lead to inconclusive results.  It would be like asking someone to trace a tree by moving their eyes and then trying to recreate the tree based on their eye movements.  Maybe but good luck. 

The visuals have an elusive nature this is why they are difficult to explain and recreate by drawing.  Many great artists have tripped and not been able to recreate their experiences (Alex Grey is damn close).  I think maybe with experience and high doses one can become slightly more efficient at analyzing these visuals although SWIM has been trying for years with little luck.  It is difficult, they are not what you think, they tend to be highly complex and mysterious.  Sure one can identify certain attributes like a face or a egyptian pharaoh like god... but the details are more difficult to pin point.  Next time try to even remember the archetypes and draw them, SWIY will likely find this is very difficult if not impossible. 

Regarding any simple patterns, which can and do appear there is no need to trace them with a lazer pointer especially if as SWIY says they are not changing.  Just look at them and describe them into a tape recorder or draw them if they are not changing just look at it and sketch it.  I think however SWIY will realize that this is not possible even if it is not rapidly changing.  The illusive nature is built into the experience, it involves much more than just visual experience, meaning, understanding, linguistic imprints... are all involved in this...