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Topic: Blue field entoptic phenomenon

	Blue field entoptic phenomenon
		In a technique known as blue field entoptoscopy, the effect is used to measure the blood flow in the retinal capillaries, which is important in diseases such as diabetes.
		The patient is alternatingly shown blue light and a computer generated picture of moving dots; by adjusting the speed and density of the computer generated dots, the patient tries to match the computer generated picture as best as possible to the perceived entoptic dots.
		Scheerer's phenomenon should not be confused with "floaters" or muscae volitantes, which are larger and darker structures that usually move slower and along straight lines; they are due to debris floating in the vitreous humor of the eye.
	www.mrsci.com /Opthamology/Blue_field_entoptic_phenomenon.php (288 words)

	Retina - Biocrawler (Site not responding. Last check: 2007-09-19)
		This is known as the blue field entoptic phenomenon (or Scheerer's phenomenon).
		It is a lack of cones sensitive to red, blue, or green light that causes individuals to have deficiencies in colour vision or various kinds of colour blindness.
		The receptive fields of retinal ganglion cells comprise a central approximately circular area, where light has one effect on the firing of the cell, and an annular surround, where light has the opposite effect on the firing of the cell.
	www.biocrawler.com /encyclopedia/Retina (1953 words)

	Entoptic phenomenon
		During the 1920s, some theosophists, unaware of the physical explanation, maintained that the moving spots seen in the blue field entoptic phenomenon were "vitality globules" related to the concept of prana in yoga.
		The blue field entoptic phenomenon has the appearance of tiny bright dots moving rapidly along squiggly lines in the visual field.
		It is much more noticeable when viewed against a field of pure blue light and is caused by white blood cells moving in the capillaries in front of the retina.
	www.mrsci.com /Opthamology/Entoptic_phenomenon.php (425 words)

	Entoptic phenomena in contemporary art
		Entoptic visions represent a pan-human, biological phenomenon, experienced by people in not only all types of cultures, but under dozens of types of influences referred to under one as altered states of consciousness, provoked by factors as sensory deprivation, hypoglycemia, migraine or intoxication.
		Entoptic visions are frequently seen by children and perfectly normal people as for instance migraine-sufferers; they are not related to any mental disorder and may also be provoked by certain eye diseases.
		To understand entoptic visions and how they relate to the arts it is therefore necessary to study both the research and testimonials of entoptic visions, to get an idea of the general scenery rather than the single elements, and observe works of art that correspond to these descriptions.
	www.entopticart.com (7468 words)

	Vision
		The autokinetic effect is a phenomenon of human visual perception in which a stationary, small point of light in an otherwise dark or featureless environment appears to move.
		Although individuals with damage to V1 are not consciously aware of stimuli presented in their blind field, Larry Weiskrantz and colleagues showed in the early 1970s that if forced to guess about whether a stimulus is present in their blind field, they do rather better than chance.
		In the center of the visual field, corresponding to the fovea of the retina, a very large number of neurons process information from a small region of the visual field.
	www.shortopedia.com /V/I/Vision (1667 words)

	Entoptic phenomenon - Wikipedia, the free encyclopedia
		A phenomenon that could be entoptical if the eyelashes are considered to be part of the eye is seeing light diffracted through the eyelashes.
		The phenomenon appears as one or more light disks crossed by dark blurry lines (the shadows of the lashes) each having fringes of spectral colour.
		The disk shape is given by the circular aperture of the pupil.
	en.wikipedia.org /wiki/Entoptic_phenomenon (668 words)

	Arch Ophthalmol -- Abstract: Blue field entoptic test in patients with ocular trauma, March 1981, Sinclair et al. 99 ...
		Arch Ophthalmol -- Abstract: Blue field entoptic test in patients with ocular trauma, March 1981, Sinclair et al.
		Blue field entoptic test in patients with ocular trauma
		The blue field entoptic test was applied to study macular function in 32
	archopht.ama-assn.org /cgi/content/abstract/99/3/464 (131 words)

	Entoptic Imagery in People and Their Art
		Entoptic imagery in art, associated with trance states in their broadest interpretation including dream states, is a pan-human phenomenon.
		This paper reviews the literature on entoptic imagery and concludes that it is indeed a pan-human phenomenon which is stimulated by a wide variety of circumstances including various medical conditions, sensory deprivation, hallucinogenic drug use, trance dancing and other means which are described.
		Because entoptic imagery is universal to humanity, it is liable to appear in the art of peoples with a variety of types of cultures.
	home.comcast.net /~markk2000/thurston/thesis.html (15368 words)

	Eye Fatigue Phenomenon - Online Tips Eye Fatigue Phenomenon (Site not responding. Last check: 2007-09-19)
		This phenomenon is the result of Calea activating the...
		may be a reflection of the phenomenon observed in 'in vitro...
		Nystagmus is a natural, normal phenomenon involving the involuntary jerking of the...
	www.fatiguemeter.com /eyefatiguephenomenon (1588 words)

	MEASUREMENTS OF LEUCOCYTE CHARACTERISTICS EVOKED BY BLUE FIELD ENTOPTIC PHENOMENON: A COMPARATIVE STUDY OF ...
		Purpose: A previous study suggested novel paradigms for measuring the speeds and numbers of leucocytes perceived in the perifoveal retinal capillaries by the blue field entoptic phenomenon (Ref. 1).
		Methods: A newly developed blue field entopscope was used; it was monitored by a PC-compatible laptop.
		The discrepancy between the two paradigms in the number measurement suggested that the AP may be influenced by the memory and light adaptation mechanisms induced by switching alternately between the two fields.
	www.ece.tufts.edu /~vanvo/Arvo95A.htm (395 words)

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	Blue field entoptic phenomenon - Wikipedia, the free encyclopedia
		Scheerer's phenomenon should not be confused with "floaters" or muscae volitantes.
		Scheerer's phenomenon is distinguished by the appearance of multiple, identical-looking bright dots that follow each other rapidly along the same path.
		Floaters are variable in appearance; although they sometimes are dots, they often have the appearance of threads or shreds of crumpled cellophane.
	en.wikipedia.org /wiki/Blue_field_entoptic_phenomenon (362 words)

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	Evaluation of the Zeiss retinal vessel analyser -- Polak et al. 84 (11): 1285 -- British Journal of Ophthalmology
		and density were measured with the blue field entoptic technique.
		with the Zeiss retinal vessel analyser and the blue field entoptic
		a stimulated particle field is shown to the subjects under study.
	bjo.bmjjournals.com /cgi/content/full/84/11/1285 (3819 words)

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	Retina Encyclopedia Article @ Despairing.net (Site not responding. Last check: 2007-09-19)
		Humans and old world monkeys have three different types of cones (trichromatic vision) while other mammals lack cones with red sensitive pigment and therefore have poorer (dichromatic) colour vision.
		In ON cells, an increment in light intensity in the centre of the receptive field causes the firing rate to increase.
		The resolution limit of the fovea has been determined at around 10,000 points.
	www.despairing.net /encyclopedia/Retina (2191 words)

	Arch Ophthalmol -- Abstract: Blue field entoptic phenomenon in cataract patients, June 1979, Sinclair et al. 97 (6): ... (Site not responding. Last check: 2007-09-19)
		Arch Ophthalmol -- Abstract: Blue field entoptic phenomenon in cataract patients, June 1979, Sinclair et al.
		The blue field entoptic phenomenon (BFE), which allows the observation of
		color perception, and the Purkinje vascular entoptic phenomenon.
	archopht.ama-assn.org /cgi/content/abstract/97/6/1092 (151 words)

	Oculistica On line -Con Risposte al Pubblico in Diretta
		This can be done by closing one eye and examining all four corners of the visual field for clarity and sharpness, then repeating with the other eye closed.
		If the disease is not treated, the visual field will become more and more narrow, obscuring central vision, and finally progressing to blindness in the affected eye(s).Visual loss related to glaucoma is irreversible, but can be prevented or slowed by treatment.
		This is known as the blue field entoptic phenomenon (or Scheerer's phenomenon).Between the ganglion cell layer and the rods and cones there are two layers of neuropils where synaptic contacts are made.
	crea.html.it /sito/oculistica/3.htm (7952 words)

	Effects of Granulocyte Colony Stimulating Factor on Retinal Leukocyte and Erythrocyte Flux in the Human Retina -- ...
		this phenomenon is caused by the fact that red, but not white,
		regarding the source of the blue-field entoptic phenomenon were
		(1990) Retinal blood flow: laser Doppler velocimetry and blue field simulation technique Masters, B eds.
	www.iovs.org /cgi/content/full/43/5/1520 (2708 words)

	vascular figure - vascularfigure
		Helmholtz comments on phenomena which could be seen easily by some observers, but could not be seen at all by others.
		Some examples of entoptical effects include the following:
		The Vascular figure is an image of the retinal blood vessels in one's own eye.
	www.kopete.org /vascular-figure.html (470 words)

	Guyton, David. L.
		He is internationally known for his contributions, inventions, and teaching in the fields of ophthalmic optics, clinical refraction, potential acuity testing, and ocular motility.
		His referral clinical practice in strabismus is heavily surgical, both pediatric and adult, with emphasis on re-operations and cyclovertical surgery, using adjustable sutures.
		Blue Field Entoptic Phenomenon in Amblyopia, Grunwald, J.E. et al, Ophthalmology, 88(10):1056-57 (October, 1981).
	www.hopkinsmedicine.org /wilmer/employees/cvs/Guyton.html (4727 words)

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	Free fatty acids/triglycerides increase ocular and subcutaneous blood flow -- Polak et al. 280 (1): 56 -- AJP - ...
		The blue field entoptic phenomenon is defined as the perception
		this phenomenon is caused by the fact that short-wavelength light
		For determination of retinal hemodynamic parameters, a simulated particle field on a video monitor was shown to the subjects
	ajpregu.physiology.org /cgi/content/full/280/1/R56 (3568 words)

	LPS-induced microvascular leukocytosis can be assessed by blue-field entoptic phenomenon -- Kolodjaschna et al. 287 ...
		LPS-induced microvascular leukocytosis can be assessed by blue-field entoptic phenomenon -- Kolodjaschna et al.
		Articles by Kolodjaschna, J. Articles by Schmetterer, L. LPS-induced microvascular leukocytosis can be assessed by blue-field entoptic phenomenon
		whether the blue-field entoptic technique may be used to quantify
	ajpheart.physiology.org /cgi/content/abstract/287/2/H691 (322 words)

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