The use of NIDEK OPD Scan II wavefront aberrometry in toric intraocular lens implantation.

PURPOSE To present case examples outlining the use of wavefront aberrometry for toric intraocular lens (IOL) implantation pre- and postoperatively. METHODS Twelve eyes that underwent AcrySof Toric IOL (Alcon Inc Laboratories) implantation were assessed pre- and postoperatively using the NIDEK OPD Scan II (NIDEK Co Ltd). Wavefront aberrometry, corneal topography, and objective visual quality were measured using the OPD Scan II with OPD-Station software. The internal and corneal aberrations were evaluated separately to determine whether the source of astigmatism was corneal, internal, or a combination of both. RESULTS All IOLs were implanted using a 2.75-mm incision. Wavefront aberrometry was used to determine the position of the incision to minimize postoperative astigmatism. The postoperative objective visual quality and wavefront maps were used to determine the effect of residual irregular or regular astigmatism. CONCLUSIONS The OPD Scan II determines whether irregular or regular astigmatism is due to the corneal surface or to the internal aberrations of the eye. The magnitude, type, and location of astigmatism can guide the proper placement of toric IOLs.