Scheimpflug Analysis of Centration and Bending of Posterior Chamber Phakic Intraocular Lenses.

PURPOSE: The aim of the study was to present a novel technique for the assessment of postoperative centration and bending in phakic intraocular lens (PIOL), illustrated through 4 patient examples.

DESIGN

This was a prospective observational study.

METHODS

Four patients (7 eyes) who presented with complaints of reduced quality of vision after implantation with a Staar Collamer plate haptic PIOL were recruited for assessment. Scheimpflug images were obtained and analyzed with respect to the apical axis and the crystalline lens by means of an in-house-developed algorithm. The program provides an estimate for the PIOL centration and bending through an analysis of the distance between the PIOL and the crystalline lens.

RESULTS

The algorithm detected PIOL bending in 5 of the 7 eyes and PIOL decentration in 3 eyes. The PIOL bending or decentration detected corresponded, in all cases, with the axis of the astigmatism-like complaints in the patient. In 2 eyes of the same patient, the analysis could not be performed because the distance between PIOL and crystalline lens was too short for reliable analysis.

CONCLUSIONS

This algorithm is a useful tool to objectively assess the postoperative complaints of patients implanted with a posterior chamber PIOL. Bending and decentration due to anatomical variations of the sulcus lens position can be measured and in many cases correlated with patients' complaints.