Lot of questions on this one. First, if she is hearing impaired then why do you have the radio on? Also, the man makes a interesting point that she doesn't understand sign language if she is hearing impaired? Our bet this had more to do with her chronic back pain and possibly the medication she is taking for that. Opioids are the most common drug prescribed for chronic back pain and have side effects of feeling light-headed, confusion, and blurred vision.