Comparison of Flap Thickness, Visual Outcomes, and Higher Order Aberrations in Eyes that Underwent LASIK Flap Creation using a Femtosecond Laser Versus a Mechanical Microkeratome
Objective: To compare the predictability of flap thickness, visual and refractive outcomes, and higher order aberrations in eyes that underwent myopic LASIK using either a Technolas femtosecond laser or a Zyoptix XP mechanical microkeratome for flap creation. Methods: The study involved a total o...
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| Language: | English |
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Philippine Academy of Ophthalmology
2012-12-01
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| Series: | Philippine Journal of Ophthalmology |
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| Online Access: | https://paojournal.com/index.php/pjo/article/view/241 |
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| author | Rachelle C. Perez, MD Emerson M. Cruz, MD Albert G. Dela Cruz, Jr., MD Robert Edward T. Ang, MD |
| author_facet | Rachelle C. Perez, MD Emerson M. Cruz, MD Albert G. Dela Cruz, Jr., MD Robert Edward T. Ang, MD |
| author_sort | Rachelle C. Perez, MD |
| collection | DOAJ |
| description | Objective: To compare the predictability of flap thickness, visual and refractive outcomes, and higher order aberrations in eyes that underwent myopic LASIK using either a Technolas femtosecond laser or a Zyoptix XP mechanical microkeratome for flap creation.
Methods: The study involved a total of 44 eyes of 22 patients who underwent LASIK. Flap creation was randomized to using the Technolas femtosecond laser in one eye and Zyoptix XP microkeratome in the contralateral eye. Flap thickness was measured intraoperatively using ultrasonic pachymetry and postoperatively using the Visante AS-OCT. Refractive outcome, visual acuity (VA), higher order aberrations, and contrast sensitivity were compared between the two groups.
Results: Twenty-two patients had LASIK for myopia or myopic astigmatism. Using ultrasonic pachymetry intraoperatively, the mean flap thickness was 134 (±10) um and 124 (±23) um in the femtosecond (FS) and microkeratome (MK) groups respectively. Comparing the deviation of the actual from the intended flap thickness, the FS group had statistically lower standard deviation compared to the MK group (p=0.04). Using the AS-OCT, the mean flap thickness at 3 months postoperatively was 119 (±10.82) um and 123 (±15.77) um in the FS and MK groups respectively. The difference in standard deviation between the two groups did not reach statistical significance (p=0.19). The mean spherical equivalent at 3 months was -0.45D (±0.42) and -0.13D (±0.16) respectively. Eightynine percent (89%) of eyes had uncorrected VA of 20/20 or better in both groups. All eyes attained best correctedVA of 20/20 or better in both groups. Differences in total higher order aberrations (p=0.09) and contrast sensitivity scores (p=0.47) were not statistically different between the two groups.
Conclusion: Flap thickness predictability was better using the Technolas femtosecond laser compared to the XP microkeratome blade. Visual and refractive outcomes, higher order aberrations, and contrast sensitivity were comparable between the 2 groups. |
| format | Article |
| id | doaj-art-9b5a7154d3d24e04a2fa063225d16baa |
| institution | Kabale University |
| issn | 0031-7659 |
| language | English |
| publishDate | 2012-12-01 |
| publisher | Philippine Academy of Ophthalmology |
| record_format | Article |
| series | Philippine Journal of Ophthalmology |
| spelling | doaj-art-9b5a7154d3d24e04a2fa063225d16baa2025-08-20T03:41:56ZengPhilippine Academy of OphthalmologyPhilippine Journal of Ophthalmology0031-76592012-12-013728390241Comparison of Flap Thickness, Visual Outcomes, and Higher Order Aberrations in Eyes that Underwent LASIK Flap Creation using a Femtosecond Laser Versus a Mechanical MicrokeratomeRachelle C. Perez, MD0Emerson M. Cruz, MD1Albert G. Dela Cruz, Jr., MD2Robert Edward T. Ang, MD3Cardinal Santos Medical CenterAsian Eye InstituteAsian Eye InstituteCardinal Santos Medical Center; Asian Eye InstituteObjective: To compare the predictability of flap thickness, visual and refractive outcomes, and higher order aberrations in eyes that underwent myopic LASIK using either a Technolas femtosecond laser or a Zyoptix XP mechanical microkeratome for flap creation. Methods: The study involved a total of 44 eyes of 22 patients who underwent LASIK. Flap creation was randomized to using the Technolas femtosecond laser in one eye and Zyoptix XP microkeratome in the contralateral eye. Flap thickness was measured intraoperatively using ultrasonic pachymetry and postoperatively using the Visante AS-OCT. Refractive outcome, visual acuity (VA), higher order aberrations, and contrast sensitivity were compared between the two groups. Results: Twenty-two patients had LASIK for myopia or myopic astigmatism. Using ultrasonic pachymetry intraoperatively, the mean flap thickness was 134 (±10) um and 124 (±23) um in the femtosecond (FS) and microkeratome (MK) groups respectively. Comparing the deviation of the actual from the intended flap thickness, the FS group had statistically lower standard deviation compared to the MK group (p=0.04). Using the AS-OCT, the mean flap thickness at 3 months postoperatively was 119 (±10.82) um and 123 (±15.77) um in the FS and MK groups respectively. The difference in standard deviation between the two groups did not reach statistical significance (p=0.19). The mean spherical equivalent at 3 months was -0.45D (±0.42) and -0.13D (±0.16) respectively. Eightynine percent (89%) of eyes had uncorrected VA of 20/20 or better in both groups. All eyes attained best correctedVA of 20/20 or better in both groups. Differences in total higher order aberrations (p=0.09) and contrast sensitivity scores (p=0.47) were not statistically different between the two groups. Conclusion: Flap thickness predictability was better using the Technolas femtosecond laser compared to the XP microkeratome blade. Visual and refractive outcomes, higher order aberrations, and contrast sensitivity were comparable between the 2 groups.https://paojournal.com/index.php/pjo/article/view/241flap thicknesslasikfemtosecond lasermicrokeratomeexcimer laser |
| spellingShingle | Rachelle C. Perez, MD Emerson M. Cruz, MD Albert G. Dela Cruz, Jr., MD Robert Edward T. Ang, MD Comparison of Flap Thickness, Visual Outcomes, and Higher Order Aberrations in Eyes that Underwent LASIK Flap Creation using a Femtosecond Laser Versus a Mechanical Microkeratome Philippine Journal of Ophthalmology flap thickness lasik femtosecond laser microkeratome excimer laser |
| title | Comparison of Flap Thickness, Visual Outcomes, and Higher Order Aberrations in Eyes that Underwent LASIK Flap Creation using a Femtosecond Laser Versus a Mechanical Microkeratome |
| title_full | Comparison of Flap Thickness, Visual Outcomes, and Higher Order Aberrations in Eyes that Underwent LASIK Flap Creation using a Femtosecond Laser Versus a Mechanical Microkeratome |
| title_fullStr | Comparison of Flap Thickness, Visual Outcomes, and Higher Order Aberrations in Eyes that Underwent LASIK Flap Creation using a Femtosecond Laser Versus a Mechanical Microkeratome |
| title_full_unstemmed | Comparison of Flap Thickness, Visual Outcomes, and Higher Order Aberrations in Eyes that Underwent LASIK Flap Creation using a Femtosecond Laser Versus a Mechanical Microkeratome |
| title_short | Comparison of Flap Thickness, Visual Outcomes, and Higher Order Aberrations in Eyes that Underwent LASIK Flap Creation using a Femtosecond Laser Versus a Mechanical Microkeratome |
| title_sort | comparison of flap thickness visual outcomes and higher order aberrations in eyes that underwent lasik flap creation using a femtosecond laser versus a mechanical microkeratome |
| topic | flap thickness lasik femtosecond laser microkeratome excimer laser |
| url | https://paojournal.com/index.php/pjo/article/view/241 |
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