Article

Posterior chamber phakic intraocular lens sizing based on iris pigment layer measurements by anterior segment optical coherence tomography

Malyugin, Boris E. MD, PhD^*; Shpak, Alexander A. MD, PhD; Pokrovskiy, Dmitry F. MD, PhD

From the Cataract & Implant Surgery Department (Malyugin, Pokrovskiy) and Clinical & Functional Diagnostics Department (Shpak), S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Russia

^*Corresponding author: Boris E. Malyugin, MD, PhD, S. Fyodorov Eye Microsurgery Federal State Institution, 127486, Beskudnikovsky Boulevard, 59A, Moscow, Russia.

E-mail: [email protected]

Submitted July 11, 2014; revised November 14, 2014; accepted December 14, 2014.

Irina N. Shormaz, MD, performed the optical coherence tomography measurements (part of repeatability study and stage 2 of the study). Djulietta G. Uzunyan, MD, PhD, performed the ultrasound biomicroscopy. Both assisted with the data collection.

FAU21-10 — Figure:
No Caption available.

First author:

Boris E. Malyugin, MD, PhD

Cataract & Implant Surgery Department, S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Russia

Presented in part at the ASCRS Symposium on Cataract, IOL and Refractive Surgery, San Francisco, California, April 2013, the ASCRS Symposium on Cataract, IOL and Refractive Surgery, Boston, Massachusetts, USA, April 2014, and the XXXI Congress of the European Society of Cataract and Refractive Surgeons, Amsterdam, the Netherlands, October 2013.

Journal of Cataract & Refractive Surgery 41(8):p 1616-1622, August 2015. | DOI: 10.1016/j.jcrs.2014.12.051

Abstract

Purpose

To use anterior segment optical coherence tomography (AS-OCT) to evaluate the clinical effectiveness of Implantable Collamer Lens posterior chamber phakic intraocular lens (PC pIOL) sizing based on measurement of the distance from the iris pigment end to the iris pigment end.

Setting

S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Russia.

Design

Evaluation of diagnostic test or technology.

Methods

Stage 1 was a prospective study. The sulcus-to-sulcus (STS) distance was measured using ultrasound biomicroscopy (UBM) (Vumax 2), and the distance from iris pigment end to iris pigment end was assessed using a proposed AS-OCT algorithm. Part 2 used retrospective data from patients after implantation of a PC pIOL with the size selected according to AS-OCT (Visante) measurements of the distance from iris pigment end to iris pigment end. The PC pIOL vault was measured by AS-OCT, and adverse events were assessed.

Results

Stage 1 comprised 32 eyes of 32 myopic patients (mean age 28.4 years ± 6.3 [SD]; mean spherical equivalent [SE] −13.11 ± 4.28 diopters [D]). Stage 2 comprised 29 eyes of 16 patients (mean age 27.7 ± 4.7 years; mean SE −16.55 ± 3.65 D). The mean STS distance (12.35 ± 0.47 mm) was similar to the mean distance from iris pigment end to iris pigment end distance (examiner 1: 12.36 ± 0.51 mm; examiner 2: 12.37 ± 0.53 mm). The PC pIOL sized using the new AS-OCT algorithm had a mean vault of 0.53 ± 0.18 mm and did not produce adverse events during the 12-month follow-up. In 16 of 29 eyes, the PC pIOL vault was within an optimum interval (0.35 to 0.70 mm).

Conclusion

The new measurement algorithm can be effectively used for PC pIOL sizing.

Financial Disclosure

No author has a financial or proprietary interest in any material or method mentioned.

Secondary Logo

Journal Logo

Posterior chamber phakic intraocular lens sizing based on iris pigment layer measurements by anterior segment optical coherence tomography