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Phacoemulsification with or without Trypan blue application and influence on iris pattern recognition system

Session Details

Session Title: Subluxed IOLs and Scleral Fixation

Session Date/Time: Wednesday 09/10/2013 | 08:00-10:30

Paper Time: 09:31

Venue: E102 (First Floor)

First Author: : S.Mati? CROATIA

Co Author(s): :    Ž. Hocenski   D. Bosnar   D. Biuk   M. Roši?   J. Bara?  

Abstract Details


Biometric systems of iris analysis and iris identification are among the most accurate and precise biometric methods. Since cataract is the leading cause of blindness in the world, and cataract surgery with intraocular lens implantation is the most common ophthalmologic surgery, its influence on the iris is of utmost importance, as subsequently on iris identification. The main surgical method for the cataract surgery today is ultrasound phacoemulsification. For reasons of easier visualisation of the anterior lens capsule and performance of phacoemulsification, vital dye trypan blue is used in eyes with white, mature cataracts. The aim of the study was to research the influence of ultrasound phacoemulsification cataract surgery on iris pattern recognition system and to determine the influence of vital dye trypan blue which is used in white and mature cataract surgery on iris pattern recognition system and on the percentage of correspondence in the group of patients who underwent phacoemulsification surgery.


This prospective study was performed on the sample of 60 patients divided into 2 groups according to the clinical cataract findings (30 patients underwent phacoemulsification surgery, 30 patients underwent phacoemulsification surgery using vital dye trypan blue). The control group consisted of 30 patients who did not undergo any eye surgery or put any topical prostaglandins.


All patients suffering from cataracts underwent cataract surgery using the method of ultrasound phacoemulsification with or without using vital dye trypan blue. The eye photographs of the patients before surgery and one month after the surgery, as well as the eye photographs of patients in the control group were entered in the database and analysed using the software for iris identification. The main result obtained by comparing those two pictures is the percentage of correspondence.


The percentage of correspondence in phacoemulsification group without using trypan blue was 85.0% (ranging from 71.0% - 89.0%), and in the group of patients with mature, white cataracts where trypan blue was used was 78.5% (ranging from 68.0% - 85.0%). The percentage of correspondence in the control group was 91.0% (ranging from 86.0% - 96.0%). The research confirmed the influence of phacoemulsification with or without using vital dye on the percentage of correspondence and the possibility of identification of persons by using the existing program package for iris identification (Man Whitney U test, p<0.001). The study did not confirm the influence of vital dye trypan blue used in phacoemulsification surgery on the percentage of correspondence in relation to patients who underwent phacoemulsification without using the vital dye (Man Whitney U test, p=0.210).


Vital dye trypan blue used during phacoemulsification does not have influence on the process of iris pattern recognition system. Although the application of biometric iris identification systems has been proved as highly reliable and precise, results obtained in this research call for correction of algorithm and modification of certain procedures in the process of person recognition (recording, lighting, etc.). This will ensure the improvement in quality, accuracy and safety of this biometric system.

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