Rowdy seemed to have regained his minimal sight and was able to navigate around the house today. So I preempted his trip to the Vet. He still is somewhat blind, but regaining his mobility means that he is still okay and not ready to cross the Rainbow Bridge yet.
I have determined that he only has night blindness, as after the sun came up, his vision improved. Tonight, I am expecting for him to have trouble again, but we will see.
From now on, it will be a day to day struggle and daily determination of his health, until his time.