Single and Multiple Stimulus Static Perimetry in Glaucoma; The Two Phases of Perimetry PDF Download
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Author: E.L. Greve
Publisher: Springer Science & Business Media
ISBN: 9401177651
Category : Medical
Languages : en
Pages : 367
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Book Description
does not vary more than 1 % over the whole surface. Stimulus: The luminance of the stimuli can be regulated by means of neutral density filters. These filters are neither entirely neutral nor completely uniform, but these variations are not significant for perimetry. The maximum luminance of the stimuli is standardized at 1000 asb (316 2 cd.m-). The standard GP for kinetic perimetry has 3 neutral density filters which reduce the luminance by 0.5, 1.0 and 1.5 log units respectively. The modification of the GP for static perimetry is supplied with an additional series of four neutral density filters, which allow luminance steps of 0.1, 0.2, 0.3 and 0.4 log units. The resulting luminance values, expressed in apostilb, are given in Table I. TABLE I Luminance values of the Goldmann perimeter 4 3 2 steps lux 1430 450 143 45 3,1 asb 1000 315 100 31,5 3,1 2 cd/m 315 100 31,5 10 3,1 ßL ±30 10 3 3,1 L log L asb 3 2,5 2 2 1,5 0,5 2 Background: 31,5 asb. = 10 cd/m • Coefficient of reflection 0,7. 1 2 (1 asb = -cd/m).
Author: E.L. Greve
Publisher: Springer Science & Business Media
ISBN: 9401177651
Category : Medical
Languages : en
Pages : 367
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Book Description
does not vary more than 1 % over the whole surface. Stimulus: The luminance of the stimuli can be regulated by means of neutral density filters. These filters are neither entirely neutral nor completely uniform, but these variations are not significant for perimetry. The maximum luminance of the stimuli is standardized at 1000 asb (316 2 cd.m-). The standard GP for kinetic perimetry has 3 neutral density filters which reduce the luminance by 0.5, 1.0 and 1.5 log units respectively. The modification of the GP for static perimetry is supplied with an additional series of four neutral density filters, which allow luminance steps of 0.1, 0.2, 0.3 and 0.4 log units. The resulting luminance values, expressed in apostilb, are given in Table I. TABLE I Luminance values of the Goldmann perimeter 4 3 2 steps lux 1430 450 143 45 3,1 asb 1000 315 100 31,5 3,1 2 cd/m 315 100 31,5 10 3,1 ßL ±30 10 3 3,1 L log L asb 3 2,5 2 2 1,5 0,5 2 Background: 31,5 asb. = 10 cd/m • Coefficient of reflection 0,7. 1 2 (1 asb = -cd/m).
Author: E. L. Greve
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Erik Louis Greve
Publisher:
ISBN:
Category :
Languages : en
Pages : 355
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: E.L. Greve
Publisher: Springer Science & Business Media
ISBN: 9789061931546
Category : Medical
Languages : en
Pages : 502
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Author: Sagarika Patyal
Publisher: Springer Nature
ISBN: 9811626014
Category : Medical
Languages : en
Pages : 185
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Book Description
This book covers interpretation of visual fields by Humphrey and Octopus perimeters and discussion of Humphrey visual fields in a variety of ocular disorders.It examines dilemmas faced by an ophthalmologist while evaluating visual fields which do not match with the clinical picture. Glaucoma, the commonest condition for visual field investigation is discussed in detail. Logical reasoningfor incorporating perimetry in glaucoma management with a clear understanding of the challenges in its interpretation is delved into. The book progresses to advanced glaucoma and glaucoma progression. It discusses a systematic evaluation of various parts of the visual field so that the reader can make a calculated management plan for their patient. Each chapter attempts to clearly enunciate factors that help in the diagnosis and features which may be confused with other conditions. Fields which help diagnosing early, advanced glaucoma and glaucoma progression with images and methods of ensuring reasonable diagnostic accuracy are included. The book incorporates separate chapters on ocular conditions which also mimic visual field defects of glaucoma with detailed modes of correct diagnosis, diagnostic dilemmas arising from retinal, macular, vascular, visual pathway lesions mimicking visual field defects of glaucoma or while coexisting with glaucoma, supported by algorithms to achieve a quick diagnosis in a busy OPD without missing the clinical findings and by using minimal investigative modalities. This book helps clinicians to prevent over diagnosis or under diagnosis of glaucoma and helps diagnose cases with morbidities causing visual field defects.
Author: E.L. Greve
Publisher: Springer Science & Business Media
ISBN: 9789061931645
Category : Medical
Languages : en
Pages : 442
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Book Description
Author: Fiona Rowe
Publisher: CRC Press
ISBN: 1482299658
Category : Medical
Languages : en
Pages : 394
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Book Description
Visual Fields via the Visual Pathway presents the varying visual field deficits occurring with lesions of the visual pathway. The book covers anatomy, pathology and signs and symptoms, plus visual field defects associated with specific parts of the visual pathway. Also covered is the basic theory of visual field assessment.This new edition includes
Author: C.T. Leffler
Publisher: Wayenborgh Publishing
ISBN: 9062999093
Category : Medical
Languages : en
Pages : 920
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Book Description
The History of Glaucoma, the latest in the Hirschberg series of the history of ophthalmology, covers the twists, turns, and paradigm-shifts in the glaucoma concept over the past two millennia. Previously, scholars were not able to agree on how the term glaucoma, which related in antiquity to the color of a diseased eye, ended up describing an excavated optic neuropathy which has nothing to do with color. The volume begins in the ancient world, and proceeds all the way to the modern era of optical coherence tomography, minimally invasive surgery, and anti-VEGF agents. Ophthalmic historians and glaucoma specialists from the United States, Europe, Asia, and Latin America have contributed their scholarship and recollections to this volume, which includes photographs from private collections, information from unpublished documents, and new translations from Latin, Arabic, French, German, and Spanish. The work of masters such as Julius Hirschberg and Max Meyerhof is supplemented by the latest scholarship, which has benefited from the explosion in digitally-accessible historical documents. This new scholarship has upended many deeply rooted beliefs about ophthalmology history. Most important, the volume relates the personal stories of eye surgeons and patients, to bring the past to life. The History of Glaucoma is a must-have for anyone interested in medical history.
Author: E.L. Greve
Publisher: Springer Science & Business Media
ISBN: 9400986440
Category : Medical
Languages : en
Pages : 394
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Book Description
The 4th International Visual Field Symposium of the International Perimetric Society, was held on the 13-16 April 1980 in Bristol, England,at the occasion of the 6th Congress of the European Society of Ophthalmology. The main themes of the symposium were comparison of classical perimetry with visual evoked response, comparison of classical perimetry with special psychophysi cal methods, and optic nerve pathology. Understandably many papers dealt with computer assisted perimetry. This rapidly developing subgroup of peri metry may radically change the future of our method of examination. New instruments were introduced, new and exciting software was proposed and the results of comparative investigations reported. There have been many confusing statements in the literature on the relative value of perimetry and the registration of visual evoked responses. Several reports attempted to bring some clarity in this issue. There is reason for further comparative research. A number of papers dealt with special psychophysical methods, i.e. methods not using the simply monocular differential threshold. The old critical fusion frequency received new attention. Fundusperimetry was used for testing spatial summation. Acuity perimetry, binocular perimetry etc. showed that there exist many possibilities for examining visual function. At present it is not clear to us what exactly the place of these methods is in our diagnostic armament. However it is quite clear that some of them are promising and may lead to a further differentiation of perimetric methods.
