Hi Peter, I used to work doing occupational therapy with dementia patents, and members of my family had vascular dementia also, so I thought I'd reply to you. Dementia does progress, however slowly, so it seems to me likely that your Selina suffered a bit of brain damage while under anaesthetic. If so, that is kind of good news because there is no reason why it would get worse. Has she adapted at all to not being able to visualize?