Head trauma symptoms and conditions

I find it very interesting about the possible link between Singulair and visual disturbances. My daughter had been told (about one year after being on Singulair) that she had damage to a nerve in one eye. She had never received any type of head trauma and the Doctor could not figure out how this happened. He told us that eventually her headaches would get so bad that she would have to have her eye removed while they tried to repair the nerve, and then they would replace her eye. I would be interested to hear if there are any other stories similar to this.