The Effect of Biomicroscope Illumination System on Grading Anterior Chamber Inflammation
Purpose To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation. Design Laboratory investigation. Methods An artificial AC was designed to replicate optically a human AC and was filled with 5-μm polystyrene beads suspended in ethanol. A high-def...
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Published in | American journal of ophthalmology Vol. 148; no. 4; pp. 516 - 520.e2 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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Elsevier Inc
01.10.2009
Elsevier Elsevier Limited |
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Abstract | Purpose To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation. Design Laboratory investigation. Methods An artificial AC was designed to replicate optically a human AC and was filled with 5-μm polystyrene beads suspended in ethanol. A high-definition video eyepiece camera recorded the moving beads. Using image processing software, the main outcomes measures determined were the average number of beads in a 1 × 1-mm field at varying widths of the slit-beam. Results The volume of light and number of beads observed increased significantly as the slit-beam widened. Additionally, 3 separate biomicroscopes of identical make and model were found to produce different levels of luminance at the same aperture dial settings, influencing the number of beads observed, with the brighter biomicroscope yielding higher bead counts. Conclusions Ability to count beads and perhaps the ability to count inflammatory cells in an inflamed eye depend on a number of factors, including the level of illumination and width of the slit-beam. This study demonstrated that the brighter the illumination and the wider the beam, the more beads were observed. This illustrates the importance of standardizing biomicroscopy, particularly where consecutive observations are used to make clinical decisions and in cases of multicenter clinical trials where clinical data are evaluated across different facilities. |
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AbstractList | To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation.
Laboratory investigation.
An artificial AC was designed to replicate optically a human AC and was filled with 5-μm polystyrene beads suspended in ethanol. A high-definition video eyepiece camera recorded the moving beads. Using image processing software, the main outcomes measures determined were the average number of beads in a 1 × 1-mm field at varying widths of the slit-beam.
The volume of light and number of beads observed increased significantly as the slit-beam widened. Additionally, 3 separate biomicroscopes of identical make and model were found to produce different levels of luminance at the same aperture dial settings, influencing the number of beads observed, with the brighter biomicroscope yielding higher bead counts.
Ability to count beads and perhaps the ability to count inflammatory cells in an inflamed eye depend on a number of factors, including the level of illumination and width of the slit-beam. This study demonstrated that the brighter the illumination and the wider the beam, the more beads were observed. This illustrates the importance of standardizing biomicroscopy, particularly where consecutive observations are used to make clinical decisions and in cases of multicenter clinical trials where clinical data are evaluated across different facilities. PURPOSETo determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation.DESIGNLaboratory investigation.METHODSAn artificial AC was designed to replicate optically a human AC and was filled with 5-mum polystyrene beads suspended in ethanol. A high-definition video eyepiece camera recorded the moving beads. Using image processing software, the main outcomes measures determined were the average number of beads in a 1 x 1-mm field at varying widths of the slit-beam.RESULTSThe volume of light and number of beads observed increased significantly as the slit-beam widened. Additionally, 3 separate biomicroscopes of identical make and model were found to produce different levels of luminance at the same aperture dial settings, influencing the number of beads observed, with the brighter biomicroscope yielding higher bead counts.CONCLUSIONSAbility to count beads and perhaps the ability to count inflammatory cells in an inflamed eye depend on a number of factors, including the level of illumination and width of the slit-beam. This study demonstrated that the brighter the illumination and the wider the beam, the more beads were observed. This illustrates the importance of standardizing biomicroscopy, particularly where consecutive observations are used to make clinical decisions and in cases of multicenter clinical trials where clinical data are evaluated across different facilities. To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation. Laboratory investigation. An artificial AC was designed to replicate optically a human AC and was filled with 5-μm polystyrene beads suspended in ethanol. A high-definition video eyepiece camera recorded the moving beads. Using image processing software, the main outcomes measures determined were the average number of beads in a 1 × 1-mm field at varying widths of the slit-beam. The volume of light and number of beads observed increased significantly as the slit-beam widened. Additionally, 3 separate biomicroscopes of identical make and model were found to produce different levels of luminance at the same aperture dial settings, influencing the number of beads observed, with the brighter biomicroscope yielding higher bead counts. Ability to count beads and perhaps the ability to count inflammatory cells in an inflamed eye depend on a number of factors, including the level of illumination and width of the slit-beam. This study demonstrated that the brighter the illumination and the wider the beam, the more beads were observed. This illustrates the importance of standardizing biomicroscopy, particularly where consecutive observations are used to make clinical decisions and in cases of multicenter clinical trials where clinical data are evaluated across different facilities. Purpose To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation. Design Laboratory investigation. Methods An artificial AC was designed to replicate optically a human AC and was filled with 5-μm polystyrene beads suspended in ethanol. A high-definition video eyepiece camera recorded the moving beads. Using image processing software, the main outcomes measures determined were the average number of beads in a 1 × 1-mm field at varying widths of the slit-beam. Results The volume of light and number of beads observed increased significantly as the slit-beam widened. Additionally, 3 separate biomicroscopes of identical make and model were found to produce different levels of luminance at the same aperture dial settings, influencing the number of beads observed, with the brighter biomicroscope yielding higher bead counts. Conclusions Ability to count beads and perhaps the ability to count inflammatory cells in an inflamed eye depend on a number of factors, including the level of illumination and width of the slit-beam. This study demonstrated that the brighter the illumination and the wider the beam, the more beads were observed. This illustrates the importance of standardizing biomicroscopy, particularly where consecutive observations are used to make clinical decisions and in cases of multicenter clinical trials where clinical data are evaluated across different facilities. To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation. Laboratory investigation. An artificial AC was designed to replicate optically a human AC and was filled with 5-mum polystyrene beads suspended in ethanol. A high-definition video eyepiece camera recorded the moving beads. Using image processing software, the main outcomes measures determined were the average number of beads in a 1 x 1-mm field at varying widths of the slit-beam. The volume of light and number of beads observed increased significantly as the slit-beam widened. Additionally, 3 separate biomicroscopes of identical make and model were found to produce different levels of luminance at the same aperture dial settings, influencing the number of beads observed, with the brighter biomicroscope yielding higher bead counts. Ability to count beads and perhaps the ability to count inflammatory cells in an inflamed eye depend on a number of factors, including the level of illumination and width of the slit-beam. This study demonstrated that the brighter the illumination and the wider the beam, the more beads were observed. This illustrates the importance of standardizing biomicroscopy, particularly where consecutive observations are used to make clinical decisions and in cases of multicenter clinical trials where clinical data are evaluated across different facilities. |
Author | Vargas-Martín, Fernando Wong, Ira G Nugent, Alex K |
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References | Henson (bib5) 1996 Rasband (bib3) Bohren (bib4) 1995 Yurkin, Semyanov, Maltsev, Hoekstra (bib1) 2007; 15 Jabs, Nussenblatt, Rosenbaum (bib2) 2005; 140 Yurkin (10.1016/j.ajo.2009.04.027_bib1) 2007; 15 Rasband (10.1016/j.ajo.2009.04.027_bib3) Bohren (10.1016/j.ajo.2009.04.027_bib4) 1995 Jabs (10.1016/j.ajo.2009.04.027_bib2) 2005; 140 Henson (10.1016/j.ajo.2009.04.027_bib5) 1996 |
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Snippet | Purpose To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation. Design Laboratory investigation.... To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation. Laboratory investigation. An artificial AC was... To determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation. Laboratory investigation. An artificial AC was... PURPOSETo determine how a biomicroscope illumination system affects the grading of anterior chamber (AC) inflammation.DESIGNLaboratory investigation.METHODSAn... |
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SubjectTerms | Anterior Chamber - pathology Biological and medical sciences Clinical medicine Clinical trials Colleges & universities Digital cameras Digital video Ethanol Humans Inflammation - classification Light Lighting Lymphocytes - pathology Macrophages - pathology Medical sciences Microscopy - instrumentation Microspheres Miscellaneous Models, Anatomic Ophthalmology University colleges Uveitis, Anterior - classification |
Title | The Effect of Biomicroscope Illumination System on Grading Anterior Chamber Inflammation |
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