Ashtanga Yogi Community

I am wondering if people who had retinal tears or detachment (which have been treated and healed properly) can still practice ashtanga.

I read in several places that yoga inverted poses should be avoided in those cases. But there seems to be no reliable medical study regarding this subject.

There also a conception that vigorous activities (such as weight lifting) should be avoided during recovery, but walking and jogging is OK. Can ashtanga be considered a vigorous activity?

What do you think?

Thanks,

Lucas