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Posterior chamber phakic intraocular lens sizing according to white-to-white or sulcus diameter

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Session Details

Session Title: Phakic IOLs I

Session Date/Time: Monday 07/09/2015 | 14:30-16:30

Paper Time: 15:51

Venue: Room 10

First Author: : A.Kovalov UKRAINE

Co Author(s): :    O. Averyanova                    

Abstract Details


To compare the predictability and efficacy of the calculation of the size of the Implantable Collamer Lens (ICL; Staar Surgical) by the “conventional” white-to-white measurement based calculation (W-W) method and by the Ultrasound Biometry (UBM) based measurement of sulcus ciliaris diameter calculation.


Clinical, retrospective, single center, non-randomized case study.


Retrospective analysis of 2 groups of consecutive ICLs implantations: 109 ICLs calculated only by W-W, and 295 ICLs calculated by using 2 methods: W-W measurement based calculation and by the Ultrasound Biometry (UBM) based measurement of sulcus ciliaris diameter. In second group all W-W calculations were verified by UBM sulcus measurement and Dr. Parkhurst UBM ICL sizing nomogram – accounting both sulcus diameter and lens rise over the sulcus plain. Follow up from 3 months up to 2 years. ICL sizing were verified by ICL position (vaulting). Vaults were assessed by slit lamp examination and measured by anterior OCT.


After the “verification” of W-W calculations by UBM measurements in 212 cases (72%) ICL size was the same, in 56 cases (19%) smaller, and in 27 (9%) bigger ICLs were chosen. Mean postoperative vault was 457(±287) and 433(±166) microns (µµ) in W-W and UBM groups. “Ideal” vault (300 - 600µµ) was achieved in 58 (52%) of W-W cases and in 214 (72.6%) of UBM group. In W-W group 5 ICLs (4.6%) were exchanged – 3 because of 0 vault, and 2 because of extremely high. There was no ICL exchange due to wrong sizing in UBM group.


Using of sulcus ciliaris diameter measurements together with the measurement of lens rise over the sulcus plain by UBM gives significantly better predictability of the postoperative vault height than “conventional” white-to-white measurement based calculations.

Financial Interest:


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