Surprisingly, they also suggest that supporters of more liberal abortion laws may have triumphed throughout the country, not just in the cosmopolitan capital, Dublin, where a strong youth vote had been anticipated.
If the vote for repeal is successful, abortion would not immediately become legal.
"The 8th amendment did not create a right to life for the unborn child - it merely acknowledged that such a right exists, has always existed, and will always exist", the pro-life Save the 8th campaign said in a statement.
"What Irish voters did yesterday is a tragedy of historic proportions", the Save The 8th group said.
Ireland has one of the lowest maternal mortality rates in the world.
Under the current law, an unborn child has the same right to life as the mother - and the maximum penalty for accessing an illegal abortion is 14 years in prison.
Repealing the Eighth Amendment was a decades-long goal of the abortion movement.
Referring to his nine-year-old son, Aaron, Kaposy said: "As the father of a child with Down's syndrome, I am opposed to the propagandistic use of people like my son in attempts to limit reproductive rights, as has happened in the Irish debate, as well as in the legislative actions taken in various American states to outlaw the abortion of foetuses with Down's syndrome".
Prime Minister Leo Varadkar's government will propose that abortions be permissible in the first 12 weeks of pregnancy. Friday, Irish voters will decide whether to repeal that amendment.
"It's a rather wonderful situation that we're going into the constitution to remove a right and we're actually going in there to remove the fundamental right to life from all unborn children". "Shortly, legislation will be introduced that will allow babies to be killed in our country". "And now the country is saying, 'No, take our hands, we want to support you'".
"We will hold the Taoiseach to his promise that repeal would only lead to abortion in very restrictive circumstances". For opponents, it would be a betrayal of Ireland's commitment to protect the unborn.
Opinion surveys suggest a continuing change of attitudes in Ireland, a traditionally Roman Catholic country that surprised many by voting in favour of same-sex marriage in 2015.
Hours before the count was even completed, exit polls showed victory had been handed to those urging reform.
Abortions would be accessible to women who are in their first 12 weeks of pregnancy.
They didn't, and her death was due to medical negligence, not lack of abortion, official investigations revealed.
"The cost of my travel home from Toronto to vote for a woman's right to choose is less than what I paid for when I was forced to travel to the U.K.to access an abortion", she said in a blog post on Amnesty's website.
Some expatriate Irish were flying home from as far as way as Bangkok, Los Angeles and Sydney to cast their ballots in a country that does not allow those overseas to vote via post or in embassies.
Journalist Lara Whyte discusses Ireland's abortion referendum with CGTN's Susan Roberts. Still others admitted the pre-born are humans, but advocated for killing them. The P.M. says the vote was the culmination of a "quiet revolution".
"To countries who maybe think that sometimes with a background quite similar to ours that this kind of change is not possible, I think yesterday that we showed this change is possible and I hope that those women will look to us as a sign of what they will achieve in their own future", she said.
The Melbourne Irish Abortion Rights Campaign group has launched the Diaspora Downunder Dollars for Choice campaign, holding fundraising events across Australia.