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Comparison of ICL sizing using WTW (white to white) measurements from different devices

Poster Details

First Author: V.Lalgudi INDIA

Co Author(s):    R. Shetty   M. Kurian   M.    A. Agrawal           

Abstract Details


To compare the ICL sizing obtained using WTW from Orbscan II, Lenstar, Nidek OPD scan III and Galilei and assess its impact on the predicted vault.


Narayana Nethralaya Bangalore


The WTW from Orbscan (Bausch & Lomb) and the Anterior chamber depth from Pentacam (Oculus) were used to calculate the ICL size. The predicted vault was calculated from the UBM (Quantel Medical) machine and achieved vault was measured by the ASOCT (Casia). In patients with normal predicted and achieved vaults, the ICL size was also calculated using the WTW from the Lenstar, Nidek OPD scan III and Galilei with the standard ACD from Pentacam. Predicted vault in each situation was compared with the achieved vault.


57 eyes (31 OD, 26 OS) of 57 patients underwent uneventful ICL implantation. The mean WTW from Orbscan was 11.56 � 0.35mm, Lenstar was 12.16� 0.47mm, Galilei was 12.02 � 0.35mm and Nidek OPD scan III was 12.32� 0.44mm and in all ICL calculations the standard ACD from Pentacam was used 3.27� 0.19mm. The mean preoperative predicted vault by Orbscan was 0.56� 0.11mm, by Lenstar 0.70 �0.13mm, by Nidek 0.71�0.12mm, by Galilei 0.69�0.12mm and the mean post-operative attained vault was 0.53 � 0.14mm.


ICL sizes by Lenstar, Nidek OPD scan III and Galilei were oversized compared to the sizes calculated by the Orbscan and with higher predicted vaulting. A correction factor is needed to accurately calculate the appropriate ICL diameter.

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