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Excimer laser platforms with different rate for FemtoLASIK procedures in low-to-moderate myopia: 100 Hz vs 500 Hz vs 1100 Hz

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First Author: A.Doga RUSSIA

Co Author(s):    I. Mushkova   A. Karimova   E. Kechin              

Abstract Details

Purpose:

To compare experimental and clinical outcomes after FemtoLASIK using excimer laser platforms with different frequency (100 Hz, 500 Hz and 1100 Hz) for the myopia treatment

Setting:

S. Fyodorov Eye Microsurgery Federal State Institution

Methods:

In the experimental study, the cornea temperature during the ablation was measured with the infrared thermographic camera NEC R300SR-S (Japan). The ablation zone depth and smoothness were measured with 3D digital microscope KH-8700 (Hirox, Japan). In the clinical study, we observed 142 eyes with myopia who had undergone FemtoLASIK procedure using the excimer lasers Microscan 100Hz (44 eyes – I group), Microscan Visum 500Hz (50 eyes – II group) and Microscan Visum 1100Hz (48 eyes – III group). All flaps were created with LDVZ6 femtosecond laser. All patients underwent refractive examination before and after surgery. Follow-up period was 6 months

Results:

The quantitative and qualitative assessments of maximum cornea surface temperature, ablation depth and ablation surface smoothness were similar between the platforms (p>0.05). Postoperatively, in the I group the UDVA 20/20 or better was achieved in 86%, II group - 94%, III group - 95.8% (p>0,05). In the I group, the gain of one or more lines of the CDVA was 9%, II group - 16%, III group - 18.8% (p=0.04, Fisher's exact test). In the I group the predictability of targeted refraction within ±0,5 D was in 79.5%, II group - 90%, III group - 92%, respectively (p>0,05)

Conclusions:

FemtoLASIK using high-frequency excimer laser platforms (500 and 1100 Hz) is more effective, safe and predictable method for low to moderate myopia correction in comparison with 100 Hz platform. The clinical study results demonstrated that there was no significant difference between the 500 and 1100 Hz excimer lasers, but the excimer laser with 1100 Hz rate allowed to reduce the procedure time and provide the patient comfort during surgery

Financial Disclosure:

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