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Clinical outcomes of the implantable collamer lens with central port: 2 year follow-up

Poster Details

First Author: E.Mertens BELGIUM

Co Author(s):                  

Abstract Details


To assess the visual and refractive outcomes at 2-year follow-up on patients who received the implantable collamer lens with central port (V4c model) for the correction of myopic and myopic astigmatism.


Medipolis Eye Center, Antwerp, Belgium


One-hundred and sixty-five eyes underwent implantation of a myopic or toric implantable collamer lens (V4C model, STAAR Surgical Inc) for myopia and myopic astigmatism correction. The new design shows a central hole that allows a more natural aqueous flow eliminating the need to perform Nd:Yag iridotomy or peripheral iridectomy. All surgeries in this study were performed by one experienced surgeon (E.L.M.) using topical and intracameral anesthesia. ICL power calculation was performed using the software provided by the manufacturer. Mean spherical refraction was -5.81±2.65 diopters (D) (range: -14.75 to 0.00 D), and mean cylinder was -0.96±1 D (range: -4.50 to 0 D). Main outcomes measures evaluated at 1-, 3-, 6- and 12-months and 2 year follow-up included: spherical equivalent, uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), vault and intraocular pressure (IOP).


No complications occurred during the surgical procedures. At 2 year the mean spherical equivalent dropped from -5.23±2.80 D (range -13.75 to 1.25 D) preoperatively to 0.01 ± 0.086 D (range 0.00 to 0.75), where 163 eyes (99%) were in the target (r2=0.99). At 1 year the mean Snellen decimal UCVA was 1.10±0.10 and mean BCVA was 1.12±0.10. One-hundred and sixty-four eyes (99%) achieved UDVA of 20/20 or better and 165 eyes (100%) had UDVA of 20/25 or better; the efficacy index was 1.08 ± 0.33. All eyes evaluated achieved CDVA of 20/20 or better. No eyes lost any lines of CDVA and 55 eyes (33%) gained 2 or more lines of CDVA; the safety index was 1.10 ± 0.32. The mean IOP value changed from 13.89±3.05 mmHg to 14.07±2.59 mmHg, before and at 2-year post surgery, respectively. Mean vault changed from 641.39±245 to 496±234 microns between 1 week and 1 year post-surgery. No adverse events were found during the follow-up period. No eye needed explantation or secondary interventions, and no case of pupillary block was detected.


The results of the present study support the good predictability, efficacy, safety and stability outcomes of the new implantable collamer lens V4C model for myopic and myopic astigmatism correction. This design, which avoids iridotomy or iridectomy, provides good IOP outcomes. FINANCIAL INTEREST: One of more of the authors... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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