Iseikonic lens implantation in anisometropia

The implantation of an iseikonic prepupillary intraocular lens in unilateral aphakia usually requires a slight (2 D) myopia of the implanted eye if the two eyes are isometropic. On the other hand, the implantation of an iseikonic implant in one eye of a anisometropic (asymmetric) eye pair can result in unexpectedly high changes in spectacle ametropia, due to differences in axial length or corneal power. The changes in ametropia after iseikonic lens implantation are discussed in relation to preoperative corneal and axial anisometropias. Alternative procedures to iseikonic implantation are described.