Suggestions on dealing with Alzheimers and repetitive phrases?

Macular degenerative disease = "clean my glasses" 5000 times a day, or since she has blurred vision in her left eye she will swtich to "itch pill" 5000 times a day, and it used to be "jello" all day long. Any suggestions on how to deal with or deter the repetitiveness? I just sit with Mom, reassure her, put her eye drops in and give her projects to do and try to change the subject or put a kids movie on to soothe her nerves. I don't want her sedated 25/7. I want her to be alert and awake and aware of what's going on around her.