I was in floor 10 when I noticed that my vision would reduce time to time as I progress through the floor. I thought it was my gear or some debuffs but everything was normal. Clairvoyance potion didn't fix my problem. So basically, my hero's vision is limited to a 3x3 square, permanently. I am almost certain that it was because of the Blops of Corruption... Playing on perma-death, hard. Is there a way to fix this? Or I am stuck playing like that?
Your gear probably is giving you a perception penalty if it's been corrupted enough. Take off the offending item to see, and replace it ASAP.
I did try to walk around and remove 1 piece of equip at a time. Nothing changed. EDIT: Damn it was the boots! They only aimed for them ;S