Visual Fields

David Henson    MSc PhD

Lecturer, Department of Ophthalmology, The University of Manchester, Royal Eye Hospital, Manchester, UK.

 

* The only fully up-to-date text in this field

* Provides details of the many visual field instruments and techniques now available

* Authoritative text

* The Henson Visual Field Analyser, distributed by Tinsley Medical Instruments, is a leading instrument in visual field testing.

 

Previously published by Oxford University Press, but now that the OUP Optometry programme has been purchased by Butterworth Heinemann, this book is being distributed by Butterworth Heinemann.

Visual Fields is an up-to-date student text on the theory and practice of visual field investigation. The advantages and disadvantages of the many different techniques available for the examination of the visual field are highlighted. The instruments currently available for analysing the visual field are described, detailing both their strategies and their techniques for analysing perimetric results.

There is a comprehensive chapter on how the visual field is affected by parameters, such as refractive errors and pupil size, with many useful tips as to how these can be controlled and compensated for.

This clear, concise, practical text is supplemented with many line illustrations and halftones making it an ideal student text or professional reference.

 

Contents:

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; Specialized strategies for examining the visual field; Amsler's charts; Confrontation test; High pass resolution perimetry; Oculokinetic perimetry; 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; 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; Glaucoma; Glaucomatous field defects; Variability of field loss; differences between low-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; Visual field instruments; Glossary of terms; Index

 

Readership: Professional and student optometrists, ophthalmologists, orthoptists and all those involved in testing visual fields.