The sense of sight was one of the five senses that collected data from the surrounding environment and sent it to the brain which in return interpreted these data and sent signals to the body to respond either chemically or physically.
Just think about it, someone who had been relying on his sense of sight since his time on earth, suddenly had one of his senses stripped from him. it wouldn't be hard to imagine that he would fail miserably due to having difficulty perceiving anything.
Simon was battered by the logs which were buffed by Irene. Days passed by with Simon sprawled on the ground most of the time unable to remain standing. What was worse, was that he was not allowed to use his skills or attack back.
All he was allowed to do was dodge. Because he was used to moving after thinking, it took an inhumane amount of perseverance to reverse that.
