Wrinkle (or fold) on eyeball?

I noticed today that the "white" of my eyeball appears to be wrinkling a little bit--It feels a little itchy/irritated (I have allergies), and when I examine it close up, the white-part stuff moves and wrinkles. I don't see a wrinkle when I just look at my eye straight on, but if I move the lid etc, I can clearly see (and sort of feel) it. This is kind of freaking me out--could it be some kind of detachment?

This eye, my left, is pretty nearsighted (-6.00, much more so than my right eye -3.00). It's also looks larger than my right eye (always has been that way). No redness, and my vision seems normal, but I'm afraid of retinal detachments/PVD/etc.
I had an MD complete eye exam last August with dilation and I saw someone for a minor infection in December--everything was normal.
Does this sound like it needs to be checked out? Thanks!!