Visual Fields
Butterworth-Heinemann Ltd (Verlag)
978-0-7506-4173-9 (ISBN)
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A discussion of the many different techniques that are available for the examination of the visual field, including kinetic, suprathreshold and threshold, highlighting their advantages and disadvantages. It also describes many of the current visual field instruments, detailing their test strategies and techniques for analysing perimetric results. The text includes a comprehensive chapter on how the visual field is affected by parameters such as refractive errors and pupil size, with many useful tips on how these can be controlled. Pathologies that affect the visual field are discussed with special chapters devoted to glaucoma and the screening for glaucomatous loss.
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; Psychophysics: Background luminance; Stimulus size; Stimulus presentation time; Stimulus speed of movement; Colour of stimulus; Psychological factors: the frequency-of-seeing curve; Strategies used in examining the visual field - Kinetic examination strategies; Static examination strategies; Alternative strategies for examining the visual field - Blue-yellow perimetry; High pass resolution perimetry; Frequency doubling perimetry; Amsler charts; Confrontation test; Oculokinetic perimetry; Extraneous factors which affect 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; Visual pathways: Retina; The optic nerve; The chiasma; The optic tracts; The lateral geniculate body; Optic radiations; The visual cortex; The differential diagnosis of visual field defects; Glaucoma: Glaucomatous field defects; Differences between normal-tension and high-tension glaucomas; Screening for visual field loss: The design of visual field screening tests; Position of stimuli; Number of stimuli; Pass/fail criteria; Quantification of visual field data: Introduction and the value of quantification; Variability; Evaluating quantification systems; The development of quantification systems; Types of quantification systems; Practical advice on how to conduct a visual field 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); Static suprathreshold examination (single stimulus); Static threshold perimetry; Establishing the threshold prior to a threshold-related suprathreshold strategy; Visual field instruments: Bjerrum screen; Dicon TKS 5000, LD 400 and SST Autoperimeters; Friedmann Visual Field Analyser Mark I and Mark II; Goldmann bowl perimeter; Henson perimeters; Humphrey Visual Field Analyzers; Octopus perimeters.
| Erscheint lt. Verlag | 11.9.2000 |
|---|---|
| Zusatzinfo | 121 ills. |
| Verlagsort | London |
| Sprache | englisch |
| Maße | 189 x 246 mm |
| Gewicht | 430 g |
| Themenwelt | Medizin / Pharmazie ► Medizinische Fachgebiete ► Augenheilkunde |
| ISBN-10 | 0-7506-4173-8 / 0750641738 |
| ISBN-13 | 978-0-7506-4173-9 / 9780750641739 |
| Zustand | Neuware |
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