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Diagnostic intraoperative OCT for the prediction of post-operative lens position in Femtosecond refractive cataract surgery

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Session Details

Session Title: FLACS II

Session Date/Time: Monday 07/09/2015 | 14:30-16:00

Paper Time: 15:42

Venue: Room 16

First Author: : J.Ma CANADA

Co Author(s): :    A. Zhu                    

Abstract Details


To predict post-operative true lens position (TLP) from 3 dimensional algorithm derived intra-operative OCT (AD-iOCT) and to use this information to improve refractive outcomes.


Veritas Eye Institute/ Cornea and Vision Science Foundation,Canada


AD-iOCT predictions were compared to TLP as well as predictions from pre-operative biometry repeated twice, from two gold standard commonly used multivariate theoretical formulas, TH-ELP, and TO-ELP. TLP was obtained from observer-blinded manually measured and validated values from 25 Scheimpflug images obtained over 1 second. Correlation coefficients, paired t-tests and Bland Altman plots were obtained.


The mean follow-up was 105 days. The mean TLP was 4.96mm (SD: 0.28). Mean AD-iOCT prediction was: 5.02mm (SD 0.32) with a correlation coefficient of r=0.88 (p<0.01). Mean 5 variable preop biometry based TO-ELP was 5.73 (SD:0.56), r=0.74 (p<0.01). Mean 3 variable TH-ELP was 5.73 (SD:0.60), r=0.59 (p<0.01). A preliminary non-linear fit was performed to create a model to help predict refractions


AD-iOCT data can more accurately predict actual MV-pELP than pre-op biometry based TH-ELP or TO-ELP, which may help improve refractive outcomes in a new non-linear fit model.

Financial Interest:

One of the authors is employed by a competing company, One of the authors is employed by a for-profit company with an interest in the subject of the presentation

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