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Biometrical iris eye recognition with cyclorotational control eye tracker system increases the safety and precision in excimer laser procedure

Poster Details

First Author: B.Pajic SWITZERLAND

Co Author(s):    Z. Cvejic   Z. Mijatovic   D. Indjin   J. Mueller           

Abstract Details


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


Eye Clinic ORASIS, Swiss Eye Reseach Foundation, Reinach AG, Switzerland


We measured and adjusted the eye tracker system in LASIK treatments on a total of 88 eyes in this study, 44 eyes with rotational tracker in Group 1 and 44 eyes with only X/Y tracker system in Group 2. The mean cylinder was -1.14 ± 1.00 D (range -5.75 to 0.00 D) in Group 1 and -1.12 ± -1.0 D (range -6.00 to -0.00 D) in Group 2. There was no significant difference between the groups regarding the mean preoperative spherical equivalent and cylinder refraction (p > 0.05).


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 mean cylinder was -0.08 ± 0.05 D (range -0.5 to 0.0 D) in Group 1 and -1.08 ± 0.75 D (range -2.25 to 0.0 D) in Group 2.


The investigation confirms that the dynamic rotational tracking system used for LASIK results in highly predictable refraction quality with significantly less postoperative re-treatments

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