Mom is 89 years old and has been blind for about 10 years. Just a few years ago, she would describe something that she thought she could see and when I told her what was actually there, she would say, "oh, my eyes must be playing tricks on me." But now she insists that what she is experiencing or seeing is real and gets angry if I say otherwise. The psychologist at her rest home told me to just go along with her imaginations, which include talking to people/children that are not present and wanting me to join the conversation. Mom's family and friends have all learned to agree with Mom no matter how strange her imaginations are. Many of the imaginary things she sees seem to be the same and there every day. What puzzles me is that, other than these imaginations, she seems so rational, logical and bright with an excellent long term memory and a pretty good short term memory. My family and I had become aware of this last August, but she has weirder and weirder experiences all the time and they seem to happen more often as time goes by, with no affect on memory. Three of her doctors say this is early onset of dementia. Is this normal? I thought dementia patience lose memory, rationalization and logic. How can she be so logical and communicate clearly, precisely and logically yet still have these weird imaginations?