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Lily Wei Yun Yang, Nathalie Pei Yu Chiam, Hon Shing Ong, Jodhbir S Mehta; Post-operative centration and positional stability of the IC-8 intraocular lens in femtosecond laser assisted cataract surgery. Invest. Ophthalmol. Vis. Sci. 2020;61(7):1682.
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The IC-8 (AcuFocus Inc., Irvine, CA) is an extended depth of focus intraocular lens (IOL). The opaque ring blocks unfocused paracentral light, while the central clear 1.36 mm monofocal allows paraxial light through. As the IC-8 has a minute optic, precise centration is crucial. We aim to evaluate IC-8 centration and post-operative stability in femtolaser assisted cataract surgery.
A prospective review of all IC-8 cases in Jun to Sep 2019 at Singapore National Eye Centre was done. Femtolaser assisted cataract surgery (LDV Z8, Ziemer, Switzerland) with IC-8 implantation in the non-dominant eye was performed by a single surgeon. Patients were evaluated at post-operative day 1 (POD1) and month 1 (POM1). Monocular best corrected and unaided visual acuity for distance and near were evaluated. Intra- and post-operative IOL centration was evaluated with Adobe Photoshop in relation to 2 reference points: the centre of the capsulorrhexis, and that of the limbus.
Eight patients (8 eyes) were studied. The mean IOL displacement relative to the central capsulorrhexis was minimal, at 0.16± 0.10 intra-operatively, 0.16± 0.05 at POD1, and 0.14± 0.12 mm at POM1. Similarly, mean displacement from the central limbus was 0.36± 0.27 intra-operatively, 0.18± 0.16 at POD1, and 0.18± 0.09 mm at POM1. Centration from the capsulorrhexis at POD1 and POM1 was not significantly different from intra-operative, p=0.64 and p=0.21. Similarly, centration from the limbus at POD1 and POM1 was not significantly different from intra-operative, p=0.15 and p=0.16.Target refraction ranged from -0.5 to -0.75D spherical equivalent (SE). At POM1, mean difference between outcome and target refraction was -0.55D SE (range -1.25 to +0.5). Mean uncorrected and best corrected LogMAR visual acuity was 0.39± 0.32 and 0.11± 0.08. Mean uncorrected and best corrected near visual acuity was N7 (range N5-10) and N6 (range N5-10), and that of intermediate visual acuity was N9 (range N5-24) and N5 (all N5) respectively. One patient had a macula hole.
The IC-8 can achieve good centration and positional stability in femtolaser assisted cataract surgery. A reproducible and stable IOL centration is especially important for the IC-8 due to its small optic.
This is a 2020 ARVO Annual Meeting abstract.
Left: IC-8 centration (in yellow) relative to the capsulorrhexis (in white). Right: IC-8 centration (in yellow) relative to the limbus (in green).
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