I have just been onto the National Blood Donor website to check donor session times - as I am about to head off to donate and I spotted a 'Tissue Donation' area - where the majority 'tissue' is donated after death i.e. organs etc. there are a few things you can donate whilst living, one of which is the amniotic membrane. The quote from the site is
'Certain sight-saving operations rely on a rather unusual donated tissue - the amniotic membrane that surrounds a baby inside the womb. This tissue is obtained, with their consent, from mothers undergoing a planned caesarian section. A single membrane can help up to 60 patients.'
I just wondered whether anyone has ever been asked to donate.