a question: my mother recently decided she wanted to give contacts a try. She is 50 yo & has been wearing progressive bifocals for a while now... She visited an optomotrist who gave her a trial pair of contacts: one for distance, and the other for near. She was told that she would get the hang of the different lenses after a while. It seems that with this pair she would be using only one eye for distance & one eye for near & her brain would have to get used to this. Is this something that is ok, as I've never encountered this? Or would she be better off getting contacts for distnace only?