| UPDATED: 09:59, Mon, Feb 22, 2021
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Up to a third of those who have had a close brush with death, have reported NDEs. Some of the common features of their experiences include feelings of contentment, psychic detachment from the body, rapid movement through a long dark tunnel, and entering a bright light. For many, NDEs are also irrefutable proof that there is life after death - in particular, the separation of the spirit from the body.
NEAR-death experiences (NDEs) are increasingly attracting the scrutiny of scientists, as they seek a rational explanation for the phenomenon - but none has as yet proved conclusive.
However, a University of Cork professor suggests a more scientific reason for the phenomenon.
Writing in the Irish Times, Emeritus Professor of Biochemistry William Reville argued that NDEs probably reflect the activity of the dying brain as oxygen levels fall and carbon dioxide levels rise.
He said: NDE reports of light at the end of a dark tunnel could simply reflect oxygen levels falling in the retina, starting at the periphery and moving inwards towards the centre, producing tunnel vision.
NDE is commonly experienced by people who have suffered an extreme medical trauma (Image: Getty)
Patients who have experienced an NDE often recall seeing bright light at the end of a tunnel (Image: Getty)
However, she went on to develop pancreatitis and became seriously ill.
Her condition deteriorated to the point that she was pronounced dead for nine minutes, as doctors desperately battled to resuscitate her.
Crystal went on to describe an amazing spiritual journey, where she met God in heaven and realised the power of his love.
She described how she was surrounded by a bright light which completely overwhelmed her as she felt the intensity of God s presence.
Crystal Macvea was pronounced dead for nine minutes (Image: Getty)
Ms Macvea described an afterlife experience (Image: Getty)
Crystal told The 700 Club: The light came to me as if I were in the middle of the tunnel yet it went on for eternity.