I always didn't have the best eyesight; my right is at 0.4, while my left is 0.1 or lower. However, I have always made do with glasses, and I didn't notice any deterioration of my vision whatsoever.
Recently, I've been noticing something that definitely wasn't there about a month ago; I can barely see in dark areas. For example; when stargazing, I used to be able to see the stars perfectly normally, but now I can barely see the brightest ones. When I look towards grounded objects, I can see their outlines silhuetted against dim light but I can't discern ones that don't have background light. When I'm "night blinded", I also seem to see something not unlike the distorted shapes moving around when you close your eyes, which blocks most of the light.
Furthermore, I seem to have a black disk made up of those moving, slightly colored shapes blocking my intermediate vision. I can discern objects at the edge of my peripheral vision just like I used to, and I can see objects in about a 5 degree circle in the middle of my sight, but everything else is clouded with the shapes. However, the size of this disk is about the size of my glasses; perhaps this has something to do with wearing glasses for an extended period of time?
I should add that I have absolutely no change in my vision strength at medium to high light, and I don't get "blinded" easily by dark to light transitions. Furthermore, even in dark areas I can see areas lit by streetlamps as usual, without the dark shapes blocking my way.
What is this, and is this curable?