There are several muscles around the eyes. It is okay to exercise and stretch them. You can probably find eye exercises in books on hatha yoga. Then rolling the eyes up won't be a problem. As long as you don't use force to get the eyes in place you will be fine.
does anyone know if you can stretch your eyes safely, or if it's harmful to keep them rolled up like that?
it would make sense that they could be stretched but i wouldn't want to try this new tek and have the chance of hurting myself.
fred