Double vision can be the described as the experience of duplicated vision similar to that which occurs when one crosses their eyes. Depending on the intensity, this effect can result in a reduced ability to function and perform basic tasks which necessitate the use of sight.
The effect can easily be suppressed by simply closing one eye. This suggests that the effect may be occurring because the brain is simply overlaying the data received from both eyes on top of each other without rendering the information into a singular 3-dimensional image as it normally would during everyday life.
Double vision is often accompanied by other coinciding effects such as acuity suppression and pattern recognition suppression. This effect is most commonly induced under the influence of moderate dosages of depressant and dissociative compounds, such as alcohol, quetiapine, ketamine, and DXM.
Compounds within our psychoactive substance index which may cause this effect include:
- Responsible use
- Subjective effects index
- Dissociatives - Subjective effects
- Deliriants - Subjective effects
- Psychedelics - Subjective effects
- Watts, A. This Is It. New York: Pantheon Books, Inc., 1960.
- Marsh, A. (1979). Visual hallucinations during hallucinogenic experience and schizophrenia. Schizophrenia Bulletin, 5(4), 628. https://doi.org/10.1093/schbul/5.4.627
- Smith, J. L., & Buncic, J. R. (1999). Drugs which can affect near vision: a useful list. American Orthoptic Journal, 49, 180-190. https://uwpress.wisc.edu/journals/pdfs/AOJ_49_178.pdf