May 2007
Volume 48, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2007
Analysis of Autofluorescence in Human Donor Eyes
Author Affiliations & Notes
  • A. C. Johnson
    Department of Ophthalmology, University of Minnesota, Minneapolis, Minnesota
  • X. Feng
    Department of Ophthalmology, University of Minnesota, Minneapolis, Minnesota
  • T. W. Olsen
    Department of Ophthalmology, University of Minnesota, Minneapolis, Minnesota
  • Footnotes
    Commercial Relationships A.C. Johnson, None; X. Feng, None; T.W. Olsen, None.
  • Footnotes
    Support AG025392, Unrestricted grant to the Dept of Ophthalmology from Research to Prevent Blindness
Investigative Ophthalmology & Visual Science May 2007, Vol.48, 5115. doi:
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      A. C. Johnson, X. Feng, T. W. Olsen; Analysis of Autofluorescence in Human Donor Eyes. Invest. Ophthalmol. Vis. Sci. 2007;48(13):5115.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose:: Autofluorescent compounds accumulate in the retinal pigment epithelium (RPE) and the relationship between autofluorescence (AF) and age-related macular degeneration (AMD) is unclear. Development of a model for qualitative and quantitative analysis will help define the role of AF with AMD. Our objective is to define the Minnesota Grading System (MGS) for autofluorescent compounds in eyebank eyes to correspond with our current clinical grading system (MGS; Olsen & Feng IOVS 45 (12): 4484-4490, 2004) of AMD.

Methods:: Human donor eyes (n=72, range=45-98yrs, mean=68±12yrs) were evaluated according to the MGS. A pre-standardized, digital image was taken using the confocal Scanning Laser Ophthalmoloscope (cSLO). The AF image superimposed digital color fundus images on the MGS photograph with precise sizing and orientation. Next, the MGS grid template was placed on the MGS-AF image. The circular grid delineates the region about the macula into 1mm (center) and 6mm (total) diameter regions. Pixel density measurements (D) were acquired using Adobe Photoshop (D=0-255 units). Each zone of the grid has a mean AF density that is calculated by D/area= true AF (tAF) by analyzing the gray-scale pixel values for each point in a designated region and mathematically subtracting areas of atrophy (D=0-38 units).

Results:: The 1mm center concentric region about the macula, tAF decreased linearly with increasing MGS level. In the 6 mm region, tAF remains constant in MGS1-3 and decreases at MGS4. One-way ANOVA analysis was significant (p=0.002) and MGS level 4 was statistically different from MGS level 1, 2 and 3 based upon Tukey-Kramer post-hoc analysis.

Conclusions:: We have defined a methodology for analyzing fundus AF using eyebank eyes that allows quantification in tissue graded according to the MGS. At MGS level 4, tAF decreases the macula, potentially due to RPE dysfunction. This model of AF (MGS-AF) in conjunction with the MGS will serve as a useful tool in future studies of AMD.

Keywords: age-related macular degeneration • retinal pigment epithelium • clinical laboratory testing 
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