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Figure 1 - Humphrey field analyser. Humphrey field analyser (HFA) is a tool for measuring the human visual field that is commonly used by optometrists, orthoptists and ophthalmologists, particularly for detecting monocular visual field. [1] The results of the analyser identify the type of vision defect.
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Visual field testing can be performed clinically by keeping the subject's gaze fixed while presenting objects at various places within their visual field. Simple manual equipment can be used such as in the tangent screen test or the Amsler grid. When dedicated machinery is used it is called a perimeter.
The visual field is "that portion of space in which objects are visible at the same moment during steady fixation of the gaze in one direction"; [1] in ophthalmology and neurology the emphasis is mostly on the structure inside the visual field and it is then considered “the field of functional capacity obtained and recorded by means of perimetry”.
It is a diagnostic tool that aids in the detection of visual disturbances caused by changes in the retina, particularly the macula (e.g. macular degeneration, Epiretinal membrane), as well as the optic nerve and the visual pathway to the brain. Amsler grid usually help detecting defects in central 20 degrees of the visual field. [2]
A History of the Mind received positive reviews from the science journalist Marek Kohn in New Statesman and Society, [4] Francisca Goldsmith in Library Journal, [5] and from Publishers Weekly, [6] mixed reviews from the biologist Lewis Wolpert in New Scientist and the psychologist George Armitage Miller in The New York Times Book Review, [7] [8] and negative reviews from John C. Marshall in ...
Don't You Dare Read This, Mrs. Dunphrey is a 1996 young adult novel written by Margaret Peterson Haddix.It tells the story of high school student Tish Bonner through journal entries assigned throughout the year by her English teacher, Mrs. Dunphrey, and follows her as her life slowly begins to spin out of control through familial and social troubles.
The visual effect is described as the loss of vision as the brain cuts off the unchanging signal from the eyes. The result is "seeing black", [ citation needed ] an apparent sense of blindness. A flickering ganzfeld causes geometrical patterns and colors to appear, and this is the working principle for mind machines and the dream machine .