That is so interesting I have never realized they do not do that on Alzheimer's or dementia patients Ive worked in that field of work referring people for my optometrist I worked for and opticians all my life and never knew this but what I do know is everyone that I sent to have this done told me they wished they could of done it sooner knowing how easy it was and how well they seen. Does he have a cataract in only one eye cause this would make sense why he could be off balance its like closing and eye when your that bad. The other thing is I know once you get it done you cant do this and that and I am wondering if its because of the do and don't and when you have dementia they wont remember or forget and could do more harm to the eye if that is the reason. I would ask your ophthalmologist this question before hand because your in that boat of what is best there both bad but if he cannot see a thing now what do you have to loose. What I mean by that lets say something goes bad cause lifting something , no bending i hear things like this can do damage even rubbing your eyes it is similar to lasik which i had and it is important not to rub your eyes and I am a eye rubber I was freaking out at doing that cause you can lift that layer they lift to do the surgery I believe cataract is similar but they put a lens there like a contact lens. It must have to do with that I cannot see any other reason why not. But if that was my mom or dad I would rather take that risk and hope for the best cause if you fall and break something your in a worst boat then the situation your in now with not seen in one eye. Hopefully its just one most times it is both eyes but they do not do both at the same time. Id like to know that answer if you ever find out. I am retired right now so I can't really ask that question for you but would love to know the reason behind it for curiosity or anyone here in this forum. Thank you and best of luck finding for who ever this is for.