I think I am getting this as well. It makes my experience a little more complicated because I had to switch to a new "make" of contact lenses around the same time (because they stopped MAKING the exact ones I've been wearing for 20+ years) but they're the same prescription in the end - yet my vision seems to be a little bit worse. I'm having trouble for the first time in my life, making out the words on tiny little bottles/packaging etc, particularly when it's not in very different colors. I blamed it on my contacts at first, but this is my second pair now, and I'm pretty sure it's the Mod. Please post more if you can confirm it in any way... like does it recover when you're on a break?