I am not really sure that Partridge's link actually shows sight as we know it. Seeing objects you can feel on your body, and putting them in different thought perspectives is not compelling and is likely quite explainable.

IMO, spiritual experiences can likely also be excluded. Aboriganial sweat lodges (and similar ceremonies) have shown similar out of body and "spiritual" (and visual-distortion) experiences.

It seems over-extending to expect a scientist to explain "scientifically" what someone says they personally experienced. The most they could do is speculate from known research. But, IMO this alone does not make an expressed personable experience any more scientifically (or otherwise) credible.

It would likely be difficult to conduct a credible scientific experiment on much of what has been described from the past.