Does heaven exist? With well over 100,000 plus recorded and described spiritual experiences collected over 15 years, to base the answer on, science can now categorically say yes. Furthermore, you can see the evidence for free on the website allaboutheaven.org.

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This book, which covers Visions and hallucinations, explains what causes them and summarises how many hallucinations have been caused by each event or activity. It also provides specific help with questions people have asked us, such as ‘Is my medication giving me hallucinations?’.

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Observations placeholder

Eye patches



Type of Spiritual Experience


Number of hallucinations: 1



Dr. Grassian was a Board Certified Psychiatrist who was on the faculty of the Harvard Medical School for over twenty-five years.

A description of the experience


From Psychiatric Effects of Solitary Confinement - Stuart Grassian

Restricted environmental stimulation conditions also occur postoperatively and in certain medical conditions. In a study of one hundred American patients with macular degeneration of the retina, a high percentage of such patients experienced disturbing visual hallucinations.

Those patients who were relatively cognitively limited, those who were socially isolated, and those with simultaneous sensory impairment in another modality (for example, hearing-impaired patients) fared worst. But other factors, including the presence of concomitant medical illness, did not appear to affect the incidence of hallucinations.

In an especially relevant study of eye patched patients, it was determined that psychologically well-adjusted patients (as assessed prior to surgery) tended not to develop visual hallucinations during the period when their eyes were patched, whereas those suffering preexisting personality disturbances did tend to develop such hallucinations.

Among those patients who did develop hallucinations, almost half developed complex hallucinations involving human figures and with content suggesting serious preoccupations with themes of depression and anxiety.

The source of the experience

Ordinary person

Concepts, symbols and science items



Science Items

Activities and commonsteps




See Suzanne Holroyd et al., Visual Hallucinations in Patients with Macular Degeneration, 149 AM. J. PSYCHIATRY 1701, 1703 (1992).