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


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Lasik Flap Thickness using the Zyoptix XP Microkeratome Susanne Stottmeister, Suphi Taneri * * Travel grant by Bausch & Lomb. ASCRS Symposium, April 4-9, 2008, Chicago. Purpose.

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Lasik Flap Thickness using the Zyoptix XP MicrokeratomeSusanne Stottmeister, Suphi Taneri** Travel grant by Bausch & Lomb

ASCRS Symposium, April 4-9, 2008, Chicago


Purpose l.jpg
Purpose

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


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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.

© B&L


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Methods II

  • Each keratome cut was performed with a new blade in a 120µm or a 140µm head coupled to a 8.5 mm or 9.5 mm suction ring with 19 or 20 mm outer diameter.


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Results

  • Measured intraoperative flap thickness was lower than labelled.

  • Flap thickness in safe range


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Flap Thickness vs. Different Head/Ring Combinations

  • Standard Deviation in most used Head/Ring combination was 22 µm


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Corneal factors affecting Flap Thickness

Keratometry showed no influence.


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Corneal factors affecting Flap Thickness

Flap thickness was not correlated to central corneal pachymetry.



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Difference between 1st and 2nd Eye

Intrapatient Comparison

Bilateral cuts with the same head size (120 µm or 140 µm, respectively) and different blades showed no dependance.


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Comparison XP vs. Hansatome

XP

Hansatome

A similar predictability of the Zyoptix XP microkeratome

compared to the predecessor model (Hansatome) was observed.


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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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