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    IOL centration stable 30 days after implantation, study confirms


    Day 1, day 30 data

    Researchers measured the centration of 59 eyes in 49 patients day 1 after surgery and 1 month after surgery using iTrace Ray Tracing technology. IOL centration was measured relative to 3 distinct landmarks–the center of the pupil, the center of the limbus, and the corneal apex.

    Figure 1. iTrace scan of the IOL centration.

    A total of 45 eyes received a monofocal IOL and 14 eyes received a toric IOL. Just over half of the surgeries (32) were performed using traditional techniques and 27 were performed using femtosecond laser assisted cataract surgery (FLACS).

    The final results were similar for both monofocal and toric IOLs, as well as for conventional and FLACS procedures, Dr. Cabot reported. For lenses implanted using conventional techniques, there was a mean supero-nasal shift of 293.80 µm relative to the pupil center and no trend relative to the limbus center or to the corneal apex. For FLACS procedures, there was a mean infero-temporal shift of 218.75 µm and no trend relative to the limbus center or the corneal apex.

    Figure 2. FLACS infero-temporal IOL shift relative to pupil center: IOL shift between POD #1 and POM #1 relative to pupil center (A), limbus center (B), and vertex (C).

    The findings are important in two areas, Dr. Cabot said. First, it should be reassuring to both surgeons and to patients that while there is a shift in IOL centration between day 1 and 1 month after surgery, the shift is small–200 to 300 µm. And while the shift can be measured reliably, it is unlikely to have any clinical effect on visual acuity or on patient satisfaction with the procedure and its outcome.

    Reassuring data

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