Lasik Flap Thickness using the Zyoptix XP Microkeratome Susanne Stottmeister, Suphi Taneri Travel grant by Bau

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Purpose. To evaluate predictability and possible factors affecting flap thickness in laser in situ keratomileusis (LASIK) using the Zyoptix XP microkeratome. . Methods. 250 primary LASIK Flaps created using 3 different B
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1. Lasik Flap Thickness using the Zyoptix XP Microkeratome Susanne Stottmeister, Suphi Taneri* * Travel grant by Bausch & Lomb

2. Purpose To evaluate predictability and possible factors affecting flap thickness in laser in situ keratomileusis (LASIK) using the Zyoptix XP microkeratome.

3. Methods 250 primary LASIK Flaps created using 3 different B&L Zyoptix XP microkeratomes were evaluated. Elements with different Serial Numbers were combined. Ultrasound subtraction pachymetry was used to determine intraoperative flap thickness.

4. Methods II Each keratome cut was performed with a new blade in a 120?m or a 140?m head coupled to a 8.5 mm or 9.5 mm suction ring with 19 or 20 mm outer diameter.

5. Results Measured intraoperative flap thickness was lower than labelled. Flap thickness in safe range

6. Flap Thickness vs. Different Head/Ring Combinations Standard Deviation in most used Head/Ring combination was 22 ?m

7. Corneal factors affecting Flap Thickness Keratometry showed no influence.

8. Corneal factors affecting Flap Thickness Flap thickness was not correlated to central corneal pachymetry.

9. Patient factors affecting Flap Thickness Age showed no influence.

10. Difference between 1st and 2nd Eye

11. Comparison XP vs. Hansatome

12. Conclusions All flap thicknesses were in the safe range. Heads and rings of different sets were practically interchangeable. Factors affecting flap thickness seem to be more device-dependant than patient-related, thus obtaining flap thickness in the first eye did not enable predictions of the flap thickness in the partner eye.


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