(Figure 1) The confidence intervals representing statistically significant change at both the 80% and 95% levels are shown in green generated from the normal population and in red generated from the keratoconic population.

(Figure 2) The ABCD parameters may be graphically displayed in two different scaling formats. “Aligned at Baseline” is the default option. With this scaling option all the baseline parameters are aligned (upper display). The other option “Full Scale” maintains the relative ABCD classification scaling (bottom display), but the confidence interval markers are more condensed.

(Figure 3) The ABCD Progression Display clearly demonstrates highly significant change on the posterior surface in spite of a stable anterior surface. The need for CXL could be demonstrated here prior to any visual loss.

(Figure 4) An 18-year-old with moderately advanced keratoconus (final “D” from BAD > 7.0) has four sequential exams over a 14-month period.

(Figure 5) A 32-year-old patient with known, but highly asymmetric, keratoconus undergoes standard epi-off CXL on the more advanced left eye. (Figures courtesy of Dr Belin)