December 2002
Volume 43, Issue 13
Free
ARVO Annual Meeting Abstract  |   December 2002
Endothelial Cell Density Is Significantly Increased In The Far Peripheral (Limbal) Region Of The Human Cornea
Author Affiliations & Notes
  • GP Holley
    Ophthalmology/Eye Center Emory University Atlanta GA
  • PE Sugarman
    Ophthalmology/Eye Center Emory University Atlanta GA
  • AR Purohit
    Ophthalmology/Eye Center Emory University Atlanta GA
  • HF Edelhauser
    Ophthalmology/Eye Center Emory University Atlanta GA
  • Footnotes
    Commercial Relationships   G.P. Holley, None; P.E. Sugarman, None; A.R. Purohit, None; H.F. Edelhauser, None. Grant Identification: Support: NEI P30EY06360, NEI EY00933, RPB
Investigative Ophthalmology & Visual Science December 2002, Vol.43, 3176. doi:
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      GP Holley, PE Sugarman, AR Purohit, HF Edelhauser; Endothelial Cell Density Is Significantly Increased In The Far Peripheral (Limbal) Region Of The Human Cornea . Invest. Ophthalmol. Vis. Sci. 2002;43(13):3176.

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

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Abstract

Abstract: : Purpose: To morphometrically assess the central, paracentral, and far peripheral (limbal) regions of the normal human corneal endothelium. Methods: Optisol-GS stored human corneas (n=50) were obtained from the Georgia Eye Bank (storage time less than 10 days). The age range was 3-75 years. The corneas were flattened with 4 radial incisions and stained for 5 minutes with 1% Alizarin red dye. Three or more photographs were taken with a Zeiss light microscope of the central, paracentral (2.0-2.5 mm from center) and far limbal (next to Schwalbe's line) endothelial regions of each cornea along with a calibration slide. The photos were enlarged, and at least 90-100 contiguous clumped cells were traced and digitized (corners method) to yield cell density (CD), coefficient of variation of cell area (CV), and hexagonality (% Hex). The data was stratified by region and age (decades in years). Means and standard error of the mean were calculated along with p values. Results: The overall central CD was 2463±87 cells/mm squared versus 2946±129 and 3790±158 for the paracentral and limbal regions, respectively. This constituted a 19.6% increase (p=0.0017) for paracentral vs. central and a 53.9% (p=0.0001) increase for the limbal region compared to the central. There was no significant difference in %Hex or CV between the central and paracentral, however, there was a 15% decrease (59±1.2 vs. 50±1.1, p=0.0001) in % Hex and a 14.2% increase (0.303 vs. 0.353) in CV comparing the central and limbal regions. When comparing by age, the limbal CD was higher (in each decade) than the paracentral CD, which was higher than the central CD. Also, there was a decrease in cell densities by age from younger to older corneas in all regions. The central had a 0.69% drop per year, paracentral 0.55% per year, and the limbal region 0.28% per year. Conclusion: The data from this morphometric evaluation suggests that the corneal endothelium has a potential limbal regeneration zone (very high cell density, high CV, low %Hex), a paracentral storage zone, and a central migration zone.

Keywords: 371 cornea: endothelium • 370 cornea: basic science • 474 microscopy: light/fluorescence/immunohistochemistry 
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