Fig. 6.

Cell density estimated in same frames by one reviewer in two sessions. A, correlation between two manual assessments of cell density; solid line is identity line. B, difference vs. mean of estimates and limits of agreement. Scans were selected from those recorded 2 and 3 years after LASIK. Variationof differences in two estimates of cell density was similar to variation of differences between one observer and the program (Fig. 5).