Download presentation
Presentation is loading. Please wait.
Published byJamie German Modified over 10 years ago
1
21/09/04www.drmathys.be ESCRS 2004 PARIS Wavefront- and Topography- guided PRK for Myopic Eyes Bernard Mathys, MD Brussels Vision Clinic
2
21/09/04www.drmathys.be ESCRS 2004 PARIS Zyoptix (B&L) for PRK 100 000 Procedures for Z – Lasik Orbscan and Aberrometry-guided ablation Tissue saving, wide optical zone, reduce treatment-induced aberrations Adapted for PRK – using the same preop measurements
3
21/09/04www.drmathys.be ESCRS 2004 PARIS Why Zyoptix ? Thin cornea: < 520 µ Large pupil Tissue saving Aberrations preop > 0.30µ RMS PSF
4
21/09/04www.drmathys.be ESCRS 2004 PARIS Technique Topography and aberrometry by the same well-trained technician Alignment under the laser, head position: crucial PRK: std technique Postop treatment: std
5
21/09/04www.drmathys.be ESCRS 2004 PARIS Results
6
21/09/04www.drmathys.be ESCRS 2004 PARIS Aberrations Measurements of all aberrations preoperatively Same postop: 1M, 3M, 6M, 12M Time development view Normal band view Orbscan
7
21/09/04www.drmathys.be ESCRS 2004 PARIS Example 1: thin corneas
8
21/09/04www.drmathys.be ESCRS 2004 PARIS Example 1: thin corneas
9
21/09/04www.drmathys.be ESCRS 2004 PARIS Example 2: large pupil
10
21/09/04www.drmathys.be ESCRS 2004 PARIS Example 2: large pupil
11
21/09/04www.drmathys.be ESCRS 2004 PARIS Example 3: limited induced aberrations
12
21/09/04www.drmathys.be ESCRS 2004 PARIS Contrast sensitivity
13
21/09/04www.drmathys.be ESCRS 2004 PARIS RMS changes
14
21/09/04www.drmathys.be ESCRS 2004 PARIS Discussion If thin cornea, PRK more suitable However, higher correction may induce more haze, delayed visual recovery, regression, etc… Our experience: exactly the same But Z-PRK: less haze, better astigmatic correction, wider optical zone, no contrast loss
15
21/09/04www.drmathys.be ESCRS 2004 PARIS Conclusion Very interesting technique Need a correction factor for the aberrometer measurements (ours: 90%) Alignment crucial Cyclotorsion Corneal marking for astigmatism
16
21/09/04www.drmathys.be ESCRS 2004 PARIS No higher RMS postop for high correction No higher RMS postop for large OZ Seems to reduce RMS for OZ 6 – 6.5 Safe and effective: no loss of VA
17
21/09/04www.drmathys.be ESCRS 2004 PARIS Thank you for your attention
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.