Volume of visual field assessed with kinetic perimetry and its application to static perimetry

John B ChristoforidisCollege of Medicine, The Ohio State University, Columbus, OH, USABackground: The purpose of this study was to quantify the volume of the kinetic visual field with a single unit that accounts for visual field area and differential luminance sensitivity.Methods: Kinetic visual fie...

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Autor principal:	Christoforidis JB
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2011
Materias:	Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/1bd0dbe7e1904c3cb2c349ef5d4d0ad6
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spelling	oai:doaj.org-article:1bd0dbe7e1904c3cb2c349ef5d4d0ad62021-12-02T00:13:35ZVolume of visual field assessed with kinetic perimetry and its application to static perimetry1177-54671177-5483https://doaj.org/article/1bd0dbe7e1904c3cb2c349ef5d4d0ad62011-04-01T00:00:00Zhttp://www.dovepress.com/volume-of-visual-field-assessed-with-kinetic-perimetry-and-its-applica-a7231https://doaj.org/toc/1177-5467https://doaj.org/toc/1177-5483John B ChristoforidisCollege of Medicine, The Ohio State University, Columbus, OH, USABackground: The purpose of this study was to quantify the volume of the kinetic visual field with a single unit that accounts for visual field area and differential luminance sensitivity.Methods: Kinetic visual field perimetry was performed with a Goldmann perimeter using I4e, I3e, I2e, and I1e targets. The visual fields of 25 normal volunteers (17 women, eight men) of mean age 33.9 &plusmn; 10.1 (range 17&ndash;64) years were obtained and digitized. Isopter areas were measured with a method devised to correct cartographic distortion due to polar projection inherent in perimetry and are expressed in steradians. The third dimension of each isopter represents sensitivity to target luminance and was calculated as log (target luminance-1). If luminance is expressed in cd/m2, the values for the third dimension are 0.5 for I4e, 1.0 for I3e, 1.5 for I2e, and 2.0 for I1e. The resulting unit is a steradian (log 103 (cd/m2)-1 which is referred to as a Goldmann. In addition, the visual fields of four patients with representative visual defect patterns were examined and compared with normal subjects.Results: Mean isopter areas for normal subjects were 3.092 &plusmn; 0.242 steradians for I4e, 2.349 &plusmn; 0.280 steradians for I3e, 1.242 &plusmn; 0.263 steradians for I2e, and 0.251 &plusmn; 0.114 steradians for the I1e target. Isopter volumes were 1.546 &plusmn; 0.121 Goldmanns for the I4e target, 1.174 &plusmn; 0.140 Goldmanns for I3e, 0.621 &plusmn; 0.131 Goldmanns for I2e, and 0.126 &plusmn; 0.057 Goldmanns for I1e. The total mean visual field volume in our study for the I target was 3.467 &plusmn; 0.371 Goldmanns.Conclusion: The volume of the island of vision may be used to quantify a visual field with a single value which contains information about both visual field extension and differential luminance sensitivity. This technique may be used to assess the progression or stability of visual field defects over time. A similar method may be applied to static perimetry.Keywords: visual field, kinetic perimetry, static perimetry, steradian, cartographic distortionChristoforidis JBDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2011, Iss default, Pp 535-541 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ophthalmology RE1-994
spellingShingle	Ophthalmology RE1-994 Christoforidis JB Volume of visual field assessed with kinetic perimetry and its application to static perimetry
description	John B ChristoforidisCollege of Medicine, The Ohio State University, Columbus, OH, USABackground: The purpose of this study was to quantify the volume of the kinetic visual field with a single unit that accounts for visual field area and differential luminance sensitivity.Methods: Kinetic visual field perimetry was performed with a Goldmann perimeter using I4e, I3e, I2e, and I1e targets. The visual fields of 25 normal volunteers (17 women, eight men) of mean age 33.9 &plusmn; 10.1 (range 17&ndash;64) years were obtained and digitized. Isopter areas were measured with a method devised to correct cartographic distortion due to polar projection inherent in perimetry and are expressed in steradians. The third dimension of each isopter represents sensitivity to target luminance and was calculated as log (target luminance-1). If luminance is expressed in cd/m2, the values for the third dimension are 0.5 for I4e, 1.0 for I3e, 1.5 for I2e, and 2.0 for I1e. The resulting unit is a steradian (log 103 (cd/m2)-1 which is referred to as a Goldmann. In addition, the visual fields of four patients with representative visual defect patterns were examined and compared with normal subjects.Results: Mean isopter areas for normal subjects were 3.092 &plusmn; 0.242 steradians for I4e, 2.349 &plusmn; 0.280 steradians for I3e, 1.242 &plusmn; 0.263 steradians for I2e, and 0.251 &plusmn; 0.114 steradians for the I1e target. Isopter volumes were 1.546 &plusmn; 0.121 Goldmanns for the I4e target, 1.174 &plusmn; 0.140 Goldmanns for I3e, 0.621 &plusmn; 0.131 Goldmanns for I2e, and 0.126 &plusmn; 0.057 Goldmanns for I1e. The total mean visual field volume in our study for the I target was 3.467 &plusmn; 0.371 Goldmanns.Conclusion: The volume of the island of vision may be used to quantify a visual field with a single value which contains information about both visual field extension and differential luminance sensitivity. This technique may be used to assess the progression or stability of visual field defects over time. A similar method may be applied to static perimetry.Keywords: visual field, kinetic perimetry, static perimetry, steradian, cartographic distortion
format	article
author	Christoforidis JB
author_facet	Christoforidis JB
author_sort	Christoforidis JB
title	Volume of visual field assessed with kinetic perimetry and its application to static perimetry
title_short	Volume of visual field assessed with kinetic perimetry and its application to static perimetry
title_full	Volume of visual field assessed with kinetic perimetry and its application to static perimetry
title_fullStr	Volume of visual field assessed with kinetic perimetry and its application to static perimetry
title_full_unstemmed	Volume of visual field assessed with kinetic perimetry and its application to static perimetry
title_sort	volume of visual field assessed with kinetic perimetry and its application to static perimetry
publisher	Dove Medical Press
publishDate	2011
url	https://doaj.org/article/1bd0dbe7e1904c3cb2c349ef5d4d0ad6
work_keys_str_mv	AT christoforidisjb volumeofvisualfieldassessedwithkineticperimetryanditsapplicationtostaticperimetry
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Volume of visual field assessed with kinetic perimetry and its application to static perimetry

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