[Postoperative lens location calculated by ray tracing error correction (RTEC) in relation to axial length and...

Postoperative lens location, defined as the distance between the posterior corneal surface and the loop-lens connection, was calculated by ray tracing error correction (RTEC) method. Parameters needed were the anterior corneal curvature and axial length before surgery; IOL power; shape factor; diameter; and postoperative refraction. Under the hypothesis that lens location is a linear function of axial length and corneal curvature, 72 X lenses (A hospital), 94 Y lenses (A hospital), 26 Z lenses (B hospital) and 32 W lenses (B hospital) inserted eyes were analyzed. Mean lens locations were 3.68, 4.28, 4.29 and 4.73 mm, respectively. Regression coefficients of the axial length were 0.291, 0.294, 0.212 and 0.189, respectively. Regression coefficients of the corneal curvature were -0.984, -0.921, -0.626 and -0.019, respectively. These results show that longer axial length or smaller corneal curvature has deeper postoperative lens location, and that the regression coefficients are similar if the hospital is the same and measuring instruments are the same.