In archaeology, the term entoptic phenomena relates to visual experiences derived from within the eye or brain (as opposed to externally, as in normal vision).
Table of Contents
What is entoptic phenomena anthropology?
In archaeology, the term entoptic phenomena relates to visual experiences derived from within the eye or brain (as opposed to externally, as in normal vision).
What is entoptic imagery?
Entoptic images have a physical basis in the image cast upon the retina. Hence, they are different from optical illusions, which are caused by the visual system and characterized by a visual percept that (loosely said) appears to differ from reality.
Are floaters Entoptic phenomena?
Other harmless entoptic phenomena include Purkinje blue arcs, Haidinger brushes, light diffraction through eye lashes, as well as floaters, photopsia, and phosphenes.
Does blue field entoptic phenomenon go away?
These “blue-sky sprites” normally disappear after a second or less. Their movement may seem squiggly, following the path of the capillaries in your eyes. And their speed varies in time with your pulse, accelerating with your heartbeat.
Is entoptic phenomenon normal?
Entoptic phenomena are visual perceptions arising from sources within the eye rather than the outside world. Most are harmless phenomena that are usually either not perceived or ignored but that may be noticed by a bright young child. They are noticed under special viewing or light conditions.
Is blue field entoptic phenomenon normal?
What you are experiencing is a very normal occurrence called the blue field entoptic phenomenon. Blood flows to your eyes through capillaries that pass over the retina — the tissue at the back of your eye that acts as a receptor for all light.
What are the 4 types of Paleolithic Art?
Archeologists have identified 4 basic types of Stone Age art, as follows: petroglyphs (cupules, rock carvings and engravings); pictographs (pictorial imagery, ideomorphs, ideograms or symbols), a category that includes cave painting and drawing; and prehistoric sculpture (including small totemic statuettes known as …
Who painted Altamira?
The earliest paintings were applied during the Upper Paleolithic, around 36,000 years ago. The site was discovered in 1868 by Modesto Cubillas and subsequently studied by Marcelino Sanz de Sautuola….Cave of Altamira.
| UNESCO World Heritage Site | |
|---|---|
| Criteria | Cultural: (iii), (i) |
| Reference | 310-001 |
| Inscription | 1985 (9th Session) |
| Extensions | 2008 |
Is blue field entoptic phenomenon visual snow?
Entoptic phenomena that are found (either alone or in combination) in visual snow, are the blue field entoptic phenomenon, floaters (the perception of which is defined as myodesopsia), self-light of the eye and spontaneous photopsia.
What are the causes of Entoptic phenomena?
The second phenomena, “dots of light darting about,” is called the blue field entoptic phenomenon because it’s easiest to see against a uniform blue field. These lights are caused by white blood cells coursing through the tiny capillaries on the retina’s surface.
What are Egyptian drawings called?
Hieroglyphs are often works of art in themselves, even though many are instead phonetic sounds. Some stand for an object or concept which we call logographic which is a graphic that represents a word (Figure 1). Today the modern symbols used on road signs would be logograms. Figure 1: Egyptian logograms.
What are entoptic phenomena?
Entoptic phenomena may be the result of visual pathway hypersensitivity causing the perception of normally subthreshold stimuli. Various entoptic phenomena have been used to assess retinal function behind opacities in the ocular media. 13 Light perception and projection should be tested routinely in eyes with very poor acuity.
What is the blue field entoptic phenomenon?
The blue field entoptic phenomenon is produced by the different absorption of red and white blood cells when the retina is illuminated with blue light. Red blood cells absorb the short wavelength light, while passing white blood cells do not, thereby allowing the flux of the perimacular white blood cells to be estimated.
What is the best method to measure entoptic phenomena?
More recent studies recognize this modality as the method to measure entoptic phenomena, as it can offer significant retinal detail as it pertains to foveal capillary detail, the size of the foveal avascular zone (FAZ) and macular blood flow, with greater accuracy than more invasive methods, such as fluorescein angiography. 3,4
Is entoptic phenomenon secondary to posterior vitreous detachment?
Here, entoptic phenomenon is perceived as vitreous floater secondary to posterior vitreous detachment. Scanning laser entoptic perimetry.