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Visual Fields

David B. Henson (Autor)

Buch | Hardcover

157 Seiten

1993
Butterworth-Heinemann Ltd (Verlag)
978-0-19-261887-0 (ISBN)

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A student text on the theory and practice of visual field investigation. It discusses the many different techniques that are available for the examination of the visual field, eg kinetic, suprathreshold and fill threshold, highlighting their advantages and disadvantages. It also describes many of the current visual field instruments describing both their strategies and their techniques for analyzing perimetric results. There is a comprehensive chapter detailing how the visual field is affected by parameters, such as retractive errors and pupil size, with tips on how these can be controlled and compensated for. Pathologies which affect the visual field are discussed, with special chapters devoted to glaucoma and the screening for glaucomatous visual field loss.

Part 1 Introduction: definition of the visual field; extent of the normal visual field; island of vision; presentation of visual field data; why do we measure the visual field?; units of measurement. Part 2 Psychophysics: background luminance; stimulus size; stimulus presentation time; stimulus speed of movement; colour of stimulus; psychological factors, the frequency of seeing curve. Part 3 Strategies used in examining the visual field: kinetic examination strategies; static examination strategies. Part 4 Specialized strategies for examining the visual field: Amsler's charts; confrontation test; high pass resolution perimetry; oculokinetic perimetry. Part 5 Extraneous factors affecting the visual field: the effect of age upon the visual field; pupil size; refractive error and defocus; correcting lens artefact; eyelid, eyelashes and eyebrow; accuracy of fixation; fixation targets; provision of an audible tone prior to stimulus presentation; patient experience - the learning effect; fatigue effects; lens and media opacities; aphakia; angioscotoma; functional field loss (malingering and hysteria); adaptation. Part 6 Visual pathways: the retina; the optic nerve; the chiasma; the optic tracts; the lateral geniculate body; the optic radiations; the visual cortex; the differential diagnosis of visual field defects. Part 7 Glaucoma: glaucomatous field defects; variability of field loss; differences between low-tension and high-tension glaucomas. Part 8 Screening for visual field loss: the design of visual field screening tests; position of stimuli; number of stimuli; pass/fail criteria. Part 9 Quantification of visual field data: introduction and the value of quantification; variability; evaluating quantification systems; the development of quantification systems; types of quantification system. Part 10 Practical advice on how to conduct a visual examination: procedure to be adopted prior to any visual field examination; kinetic strategy for wall-mounted tangent screens (central 30 degrees); kinetic strategy for bowl perimeters; static suprathreshold examination - multiple stimulus, single stimulus; static full threshold perimetry; establishing the threshold prior to a threshold-related suprathreshold strategy. Part 11 Visual field instruments: Bjerrum screen; Dicon TKS4000; Fincham Sutcliffe screener; Friedmann visual field analyzer mark I and mark II; Goldmann bowl perimeter; Henson CFS2000 and CFA3000; Humphrey visual field analyzer; Octopus perimeters; Kowa AP-125 and AP-340.

Erscheint lt. Verlag	30.11.1993
Zusatzinfo	halftones, line figures, tables, bibliography
Verlagsort	London
Sprache	englisch
Maße	180 x 240 mm
Gewicht	363 g
Themenwelt	Medizin / Pharmazie ► Gesundheitsfachberufe
	Medizin / Pharmazie ► Medizinische Fachgebiete ► Augenheilkunde
	Technik ► Medizintechnik
ISBN-10	0-19-261887-3 / 0192618873
ISBN-13	978-0-19-261887-0 / 9780192618870
Zustand	Neuware