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Repeatability in white-to-white measurement and comparison with sulcus diameter for assessment of size of implantable collamer lens

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Session Details

Session Title: Phakic IOLs

Session Date/Time: Monday 09/10/2017 | 08:30-10:20

Paper Time: 09:12

Venue: Meeting Center Room I

First Author: : R.Sinha INDIA

Co Author(s): :    S. S   R. Singh   T. Agarwal   N. Sharma   S. Khokhar   J. Titiyal     

Abstract Details


To study the repeatability in white to white (WTW) measurements with IOL Master, Orbscan, Lenstar and I-trace and compare with sulcus to sulcus (STS) diameter to assess the correct size of implantable collamer lens (ICL).


Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi


A prospective study was conducted on 71 eyes of 36 patients who were planned for implantation of ICL. Five readings of WTW using Orbscan II, IOL Master, Lens Star, I Trace, Digital Vernier Calipers and STS using ultrasound biomicroscopy (UBM) were taken. The repeatability of the data was analysed. The ICL vault was recorded postoperatively by anterior segment ocular coherence tomography (ASOCT) on day 1, 1 week, 1month, 3 months, 6months, and 1year.


Highest repeatability of WTW was seen with IOL Master with coefficient of repeatability of 0.88. Digital calipers for WTW was found to have the highest correlation with Orbscan followed by lenstar and IOL Master. UBM estimated better ICL size compared to Orbscan in 7% cases.


IOL Master, in view of highest repeatability, may be used alternatively to Orbscan for WTW with a correction factor for calculation of ICL size. Incorporation of STS in calculating the ICL size along with WTW by digital callipers or orbscan can yield more accurate ICL vault.

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