Ball Python Eye Indent

I had the same exact issue about three months ago in a setup almost exactly like yours during a very dry Chicago March. It was absolutely the lack of humidity in the tank, even though my digital hygro read at a constant 50 to 60%. I increased the humidity by creating a "sauna" with a 4x6 Tupperware container and lid. I cut a golf ball sized hole in the lid of the Tupperware, filled the container about 1/2" of wet paper towels, then snapped the lid back on. I placed this Tupperware on the warm side so the UTH would warm and create evaporation in the "sauna." My girl never actually went in the sauna, even though she could've easily fit. Just having that in the tank increased the humidity about 20%. Within two days the dent in the eye was back to normal.

Here's a link to my post about it from March:

https://ball-pythons.net/forums/show...28#post2522228