Never give up hope. I am a stage IV lung cancer patient who had 3 brain lesions (not eye though). I had GammaKnife radiation and have had no further metastasis. I remain on Tarceva, my only chemotherapy treatment. I had CyberKnife radiation at 18 months after the tumor started to grow again. After 25 months, I currently have no evidence of disease! No one knows how your father will respond to treatment and no one knows how his body will fight on his own. One doctor said he would only have given me 4-6 months if he had seen my CT at diagnosis. I believe that love, joy, music, meditation, eastern energy medicine, community, and exercise helped strengthen my will to live and my power to fight but your father will need to find the things that bring him the most joy in all the days he has to live. A good way to help is to engage with him in something he likes. If he feels better after doing it, then keep on doing it. He will get better and better at knowing what his body needs.