.eye2dir
From WikiManual
Turns eye 2 counterclockwise with given amount (at default, eye 2 is at 105 - for reference, eye 5 is at 0). A full rotation is 1256, and a 90 degree turn counterclockwise is 314. For value n, use should look something like this:
n .eye2dir store
This is in memory slot 522 (knowledge of this is not necessary to make any kind of organism - YOU DO NOT NEED TO MEMORIZE THIS NUMBER!).