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Sensors 2017, 17(6), 1211;

Excimer Laser Surgery: Biometrical Iris Eye Recognition with Cyclorotational Control Eye Tracker System

Swiss Eye Research Foundation, Eye Clinic ORASIS, 5734 Reinach AG, Switzerland
Faculty of Sciences, Department of Physics, University of Novi Sad, Trg Dositeja Obradovica 4, Novi Sad 21000, Serbia
Medical Faculty, Military Medical Academy, University of Defans Belgrade, Belgrade 11000, Serbia
Division of Ophthalmology, Department of Clinical Neurosciences, Geneva University Hospitals, Genève 1205, Switzerland
School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 26 March 2017 / Revised: 22 May 2017 / Accepted: 23 May 2017 / Published: 25 May 2017
Full-Text   |   PDF [1735 KB, uploaded 25 May 2017]   |  


A prospective comparative study assessing the importance of the intra-operative dynamic rotational tracking—especially in the treatment of astigmatisms in corneal refractive Excimer laser correction—concerning clinical outcomes is presented. The cyclotorsion from upright to supine position was measured using iris image comparison. The Group 1 of patients was additionally treated with cyclorotational control and Group 2 only with X-Y control. Significant differences were observed between the groups regarding the mean postoperative cylinder refraction (p < 0.05). The mean cyclotorsion can be calculated to 3.75° with a standard deviation of 3.1°. The total range of torsion was from −14.9° to +12.6°. Re-treatment rate was 2.2% in Group 1 and 8.2% in Group 2, which is highly significant (p < 0.01). The investigation confirms that the dynamic rotational tracking system used for LASIK results in highly predictable refraction quality with significantly less postoperative re-treatments. View Full-Text
Keywords: cyclorotation control eye tracker system; Excimer laser; refractive surgery cyclorotation control eye tracker system; Excimer laser; refractive surgery

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Pajic, B.; Cvejic, Z.; Mijatovic, Z.; Indjin, D.; Mueller, J. Excimer Laser Surgery: Biometrical Iris Eye Recognition with Cyclorotational Control Eye Tracker System. Sensors 2017, 17, 1211.

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