Further analysis of assessments of the coefficient of variation of corneal endothelial cell areas from specular microscopic images

The aim of this study was to compare two methods of assessments of the coefficient of variation (COV) of endothelial cell area. A single image (Topcon SP-2000P specular microscope) was obtained from the central region of the corneal endothelium of 45 healthy white (Norwegian) individuals, aged from 24 to 43 years and without a history of major eye disease or surgery. The image file was printed to A3-size, the cell-cell boundaries marked manually and the areas of the cells measured with a digitiser pad. The same image file was independently processed by the semi-automated Topcon IMAGEnet system. From either method, the cell area data from 100 contiguous cells approximately in the middle portion of the images were used to calculate the average cell area (AVG), the coefficient of variation (COV) on the cell areas and the endothelial cell density (ECD).