Okay on a serious note, there is NO WAY IN HELL they would remove a pacemaker!!!!!!!! It makes me wonder if you are joking because how could you possibly think they would do that? As for the glasses. Don't worry about it. As for being further back, that makes no difference, so with poor vision i'd say go for the closer seats, just sit towards the center, not an aisle and you'll be fine. If you make it clear you don't want your glasses touched, I'm positive they won't touch them.
<-- Gwen Stewart, SOLoist at the last show of RENT
Cages or wings?
Which do you prefer?
Ask the birds.
Fear or love, baby?
Don't say the answer
Actions speak louder than words.
(Tick, Tick... BOOM!)