Dented eyes is more often a sign of dehydration. As long as he is not in a shed phase you can try soaking for a short time.
- 30 min
- 85-88 degree, don't guess temp
- depth equal to thickest part of the body.
- can put a wash cloth or towel in water for him to rest on.
If its dehydration the eyes should go back to normal, then fix your humidity issue.
My female normal has had this issue in the past.