van Heuven et al., "Entoptic
foveal avascular zone measurement and diabetic retinopathy," Optometry and Vision Science Official Publication of the American Academy of Optometry, vol.
Enhancement of creative expression and entoptic
phenomena as after-effects of repeated ayahuasca ceremonies.
The animation goes on to explain blue field entoptic
phenomenon, or Scheerer's phenomenon the fleeting sparks which diffuse across the field of vision.
Lewis-Williams also argues that the shininess of quartz represents the entoptic
phenomena of the first stage of altered consciousness (2002: 18-19).
Pieces of prehistoric art discovered all around the world suggest that optical illusions or entoptic
phenomena may have been part of the artistic experience of our ancestors.
And while the spray-painting in the "Vandalism" series evokes graffiti--it has the same cryptographic melancholy, the same quality of addressing the viewer as unreadable commentary on postindustrial decay--no such social valence can be detected in "Zuma." The patterns in these images seem as obsessive and entoptic
as Yayoi Kusama's, and are sometimes as visually disorienting.
Key Words: Blind spot; cornea; entoptic
; eye; Jovea; iris; optic nerve; Purkinje; retina; transillumination; vision.
Individual variation of visual nystagmus, eyeblinks, comprehension/literacy, and sundry features of entoptic
and nonentoptic origin provide the noise background within which reading rate is embedded.
(1988): "The signs of ali times: entoptic
phenomena in Upper Paleolithic art", Current Anthropology, 29, pp.
Postulating an ancient origin of shamanism, on the basis of entoptic
phenomena observed in rock-art, and supported by ethnographic accounts, this study places earlier work, such as that of J.D.
Today, shamanistic explanations in archaeology and in rock-art research focus especially on the universality of altered states of consciousness (drug-induced, caused through lack of sleep, excessive active participation in social rituals or the like), the role of shamanism in ritual behaviour and collective consciousness, and the universality and biological foundations of visionary experiences and entoptic