Can Alzheimer's and dementia cause loss in vision?

A fellow caregiver asked...

My aunt was just told that she has mild Alzheimer's and dementia. She is also on a lot of medications. Her vision is bad and has been bad for about 4 years now. She doesn't get any exercise. if I leave she wont remember the conversation that we had 2 hours ago. When she talks to you she doesn't look at your face. When you walk in to the room she wont recognize you unless you start talking. Can dementia and Alzheimer's affect vision loss? She has seen a lot of ophthalmologists at UCLA hospital and has had laser and Lasik eye procedures done.