Retinal detachment/ is this a possibility if old tear and evolving pvd in that eye?

Of course: It can tear further. If you have any change in vision and even if you dont see an eye doctor yearly.

Absolutely. Yes. : Although more likely with a recent or fresh tear, a retinal detachment can occur with any tear, particularly in the process of developing a PVD or posterior vitreous detachment. The PVD is a consequence of vitreous separation and liquefaction. In is a natural process. A laser treatment will substantially reduce the risk of a detachment. If the old tear is pigmented well, then no laser needed.