Verion vs IOLMaster: which is more accurate in predicting postoperative spherical outcomes for phacoemulsification with intraocular lens implant surgery?

Session Details

Session Title: Presented Poster Session: Equipment, Instrumentation & Surgical Devices

Venue: Poster Village: Pod 1

First Author: : A.Sachdev UK

Co Author(s): :    S. Madge                       

Abstract Details

Purpose:

The IOLMaster (Carl Zeiss Meditec, Jena, Germany) is generally regarded as the biometric standard in planning the dioptre of the IOLs for cataract surgery. The VERION Image Guided System (Alcon Laboratories, Inc., Fort Worth, TX) is a recently developed system to provide accurate keratometric readings, IOL power calculations with axial length input from IOLMaster measurements, an intraoperative guidance system and post-operative refractive measurements. The authors aim to analyse the accuracy in post-operative spherical outcomes for the chosen IOL implanted for the IOLMaster vs VERION systems.

Setting:

A retrospective audit was carried out of all patients who had cataract surgery using AMO Tecnis monofocal lenses under the care of the senior author using both the IOLMaster and VERION systems from March 2017-November 2017 at Nuffield Health Hereford.

Methods:

A database of 80 sequential patients (with axial length 22-26mm) who underwent cataract surgery at Nuffield Health Hereford from March 2017-November 2017 was analysed. These patients were both measured using the IOLMaster and VERION systems and the pre-operative spherical predictions were obtained. The actual post-operative spherical equivalent was calculated from the post-operative refraction data and compared to the predictive spherical outcome values for both the IOLMaster and VERION systems using the SRK/T formula. A paired T-test was also performed to calculate the statistical significance of the results.

Results:

The results showed that there was, on average, a difference of -0.0496D (standard deviation 0.427) in the post-operative spherical equivalent outcome compared to the IOLMaster prediction and an average difference of -0.0464D (standard deviation 0.429) in the post-operative spherical equivalent outcome compared to the VERION prediction. The range of differences in the post-operative spherical equivalent outcomes was -1.255 to +0.935D compared to the IOLMaster predictions, and -1.305 to +0.89D compared to the VERION predictions. The T-test calculated a value of 0.913. Therefore p >0.05.

Conclusions:

The results show that both the IOLMaster and VERION had very similar predictive abilities in post-operative spherical outcomes for cataract surgery with similar averages and ranges of results. The T-test showed no statistical significance between the IOLMaster system measurements and the VERION system measurements. The authors can conclude that the VERION image guided system shows a high correlation with the IOLMaster data and therefore can potentially be used as an alternative assessment tool in cataract surgery.

Financial Disclosure:

None