MIL 'lost' her bifocals at the day centre about a month ago. I was all for going out and getting another pair as I have the prescription for her glasses. But in the meantime we gave her a pair of my old varifocals (my eye sight is much worse than hers). She says she can see perfectly out of them I can not see any point in getting more expensive glasses for her if she really can't tell the difference. Does anyone else have experience or any advice please?