Comparative Results of 5th and 6th Generation in Excimer Laser LASIK Surgery
Purpose
To compere the use of MEL 80 (Zeiss) versus MEL 90 (Zeiss) in our practice while performing LASIK surgery.
Methods
We took the values of different preoperative and post-operative parameters such as: Aspheric Equivalent, Safety, Efficiency and Time of performing surgery, Aberrations (coma) in 86 eyes which had MEL 90 surgery performed and 116 eyes which had MEL 80 surgery performed and we compared the results looking for a difference on both Lasers and whether an improvement in overall parameters when using ultimate generation laser technology can be established. All patients where operated with Intralase FS 150 prior to excimer therapy and all the surgeries were performed by the same ophthalmologic surgeon.
Results
In relation to “Aspheric Equivalent” with the MEL 90 laser we recorded that 97% of patients had residual +/- 0.5diopter and 90.1% had residual +/- 0.25 diopter ( -0.017 +/- 0.21), with the MEL 80 laser we recorded that 89.7% of patients had residual +/- 0.5diopter and 77.6% had residual +/- 0.25 diopter ( -0.16 +/- 0.28)
In “Safety parameters” we established the number of eyes losing one line of vision after the surgery in comparison to the pre-operative conditions taking as reference the BCVA. We had no case repot with the MEL 90 and just one case with the MEL 80 with a patient losing one line of vision.
In “Efficacy parameters” the post- operative vision without correction and the BCVA prior to surgery recording in all cases >90% of improvement
Conclusion
Comparing the results from both refractive lasers (MEL 90 and MEL 80), when using ultimate generation technology (MEL 90) an improvement in overall parameters can be established.