Copenhagen 2016 Registration Programme Exhibitor Information Virtual Exhibition Satellite Meetings Glaucoma Day 2016 Hotel Star Alliance

10 - 14 Sept. 2016, Bella Center, Copenhagen, Denmark

This Meeting has been awarded 27 CME credits


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A new sizing method for the implantable collamer lens (ICL)

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Session Details

Session Title: Presented Poster Session: Phakic IOLs III

Session Date/Time: Tuesday 13/09/2016 | 09:30-11:00

Paper Time: 10:00

Venue: Poster Village: Pod 4

First Author: : K.Vandekerckhove SWITZERLAND

Co Author(s): :    C. Bergin              

Abstract Details


Choosing the correct size for the phakic Implantable Collamer Lens (ICL) is crucial. White-to-white (WtW) measurement is the US FDA-approved method for ICL sizing. This method is associated with a high rate of suboptimal sizing, with either over- or under-vaulting. Alternatives approaches are based on sulcus-to-sulcus (StS) or on angle-to-angle (AtA) measurements. StS measures are reportedly highly variable (2-3%) in comparison to automated WtW measures (<.5%) or AtA measures (<.5%).


We implanted the most recent ICL version (V4c) in 36 consecutive myopic eyes (18 patients) in the Vista Alpina eye center (one surgeon). Postoperative vault (1 month) was measured with OCT (Heidelberg Spectralis).


Using a “best fit” stepwise regression model, the predictive value for vault of different pre-operative measurements was estimated. White-to-white (WtW; Galilei 6, Scheimpflug), sulcus-to-sulcus (VuMax, UBM), anterior chamber depth (ACD; Galilei 6, optical biometry), angle-to-angle (AtA) and lens rise (Heidelberg Spectralis, OCT), average keratometry (Galilei 6, Scheimpflug), ICL power, as well as ICL size and axial length were entered into the model.


The difference between ICL size and AtA was more strongly associated with postoperative vault than the difference between ICL size and WtW (r=0.41, p=0.002, r=0.19, p=0.04 respectively). The best-fit model formula included ACD and the difference between ICL and AtA. With this model, the difference between predicted and postoperative vault was: 0-100 µm, 100-200 µm, 200-300 µm, 300-400µm, >400 µm in 33%, 36%, 17%, 14% and 0%.


OCT based measurement of AtA appears to be more strongly associated with post-operative vault than the traditional WtW measure. Further research will be required to validate this prediction formula for post-operative vault as an alternative method to the standard WtW based ICL sizing algorithm.

Financial Disclosure:


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