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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.
The macula corresponds to the central 17 degrees diameter of the visual field; the fovea to the central 5.2 degrees, and the foveola to 1–1.2 degrees diameter. [ 10 ] [ 11 ] [ 12 ] Note that in the clinical literature the fovea can refer to the central 1–1.2 deg, i.e. what is otherwise known as the foveola, and can be referred to as the ...
Perimetry more carefully maps and quantifies the visual field, especially at the extreme periphery of the visual field. The name comes from the method of testing the perimeter of the visual field. Automated perimeters are used widely, and applications include: diagnosing disease, job selection, visual competence assessment, school or community ...
Visual field-bitemporal hemianopia Visual field-binasal hemianopia. A lesion involving complete optic chiasm, which disrupts the axons from the nasal field of both eyes, causes loss of vision of the right half of the right visual field and the left half of the left visual field. [3] This visual field defect is called as bitemporal hemianopia.
[3] Swiss ophthalmologist Marc Amsler described the Amsler grid in the year 1945. It was the first functional test proposed to evaluate metamorphopsia. [4] He may have gotten the idea of the grid from Edmund Landolt, who used a similar small card with a grid pattern to be kept in the center of the visual field testing instrument perimeter. [3]
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.
In the book, a British spy named Hempher, working in the early 1700s, tells of disguising himself as a Muslim and infiltrating the Ottoman Empire with the goal of weakening it to destroy Islam once and for all. He tells his readers: "when the unity of Muslims is broken and the common sympathy among them is impaired, their forces will be ...
The book was known by the nickname "Tante Frieda" [1] or "T.F." [2] A modified form is still in use today by the Federal German Army (Deutsches Heer). [citation needed] The approximate equivalent U.S. Army field-manual was FM 100–5, now re-issued as FM 3–0, Operations (with later revisions) and available for download at the U.S. Army ...