![]() ![]() ![]() That clear space lets light pass through and we see a quickly moving dot of white. David Lewis-Williams's system Stage 1 Experiences include geometric visual patterns such as dots, zagging lines, as well as grid patterns which are all common shapes which are universally understood by the human condition. The cells are nearly the width of those capillaries, so they cause a little bit of a traffic jam, where red blood cells pile up behind them and a clear plasma space builds up in front of them. Animals, churingas and rock art in Late Mesolithic Northern Scandinavia. These lights are caused by white blood cells coursing through the tiny capillaries on the retina’s surface. aspects concerning the study of rock art images from northernmost Europe. 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. However, it is important to always remember that subjective descriptions of these phenomena are notoriously inexact. They appear as irregular colourless spots or ellipses, which look like 'ghost cells', often observed by an individual when staring at a bright background. When the floaters drift close to the back of your eye, they cast a shadow on the retina that you can see against a uniform background. Entoptic imagery has been used to demonstrate the position of an opacity in the eye, measure the size of the foveal avascular zone, estimate leukocyte velocity, and the subjectively detect scotomas. Floaters Perhaps the most commonly observed entoptic phenomenon is floaters, otherwise known as 'muscae volitantes' or 'flying gnats'. "They might be bits of tissue, red blood cells or clumps of protein," the narrator explains, all floating in the vitreous humor contained within your eyeball. The "small worms or transparent blobs" are eye floaters or muscae volitantes, Latin for "hovering flies," explains Michael Mauser in this TED Ed video ( via CasesBlog). If you’re reading this at night, try a blank computer screen. Any bright, uniform background should work. Whether it’s the clear blue of a sunny day or the overcast gray of winter, you should be able to see a familiar sight-slightly darker or fuzzy blobs that dip and float when you shift your gaze and sparkling dots that zig and zag. ![]()
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