Posterior corneal curvature
corneal curvature, Barrett, astigmatism, keratoconus
ASTIGMATISM, BARRETT, IOL, KERATOCONUS
Recent studies have shown that posterior corneal curvature, especially maximal point of elevation over the best-fit reference image, was statistically significant for keratoconus [The absolute value of the posterior surface being smaller will affect the IOL calculation if the posterior corneal curvature value is used to calculate the total corneal power. However, recent studies using the Barret toric calculator showed that an estimated posterior curvature is just as accurate as a measured corneal curvature when looking at post-cataract refractive outcomes. As the Barrett formula is the current standard for toric IOL calculations, the difference in absolute value measurement of the posterior corneal surface between the Pentacam and CASIA will have little clinical difference in accuracy when correcting astigmatism, as the assumption has shown equivalent results to measured values. The anterior corneal surface measurements between the Pentacam and CASIA, which are more important in corneal measurement when performing IOL calculations, were not statistically different.