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Comparative Study
. 2018 Mar 5;18(1):71.
doi: 10.1186/s12886-018-0734-1.

High incidence of rainbow glare after femtosecond laser assisted-LASIK using the upgraded FS200 femtosecond laser

Yu Zhang  1 , Yue-Guo Chen  2
Affiliations
Comparative Study

High incidence of rainbow glare after femtosecond laser assisted-LASIK using the upgraded FS200 femtosecond laser

Yu Zhang et al. BMC Ophthalmol. .

Abstract

Background: To compare the incidence of rainbow glare (RG) after femtosecond laser assisted-LASIK (FS-LASIK) using the upgraded FS200 femtosecond laser with different flap cut parameter settings.

Methods: A consecutive series of 129 patients (255 eyes) who underwent FS-LASIK for correcting myopia and/or astigmatism using upgraded WaveLight FS200 femtosecond laser with the original settings was included in group A. Another consecutive series of 129 patients (255 eyes) who underwent FS-LASIK using upgraded WaveLight FS200 femtosecond laser with flap cut parameter settings changed (decreased pulse energy, spot and line separation) was included in group B. The incidence and fading time of RG, confocal microscopic image and postoperative clinical results were compared between the two groups.

Results: There were no differences between the two groups in age, baseline refraction, excimer laser ablation depth, postoperative uncorrected visual acuity and refraction. The incidence rate of RG in group A (35/255, 13.73%) was significantly higher than that in group B (4/255, 1.57%) (P < 0.05). The median fading time was 3 months in group A and 1 month in group B (P > 0.05).The confocal microscopic images showed wider laser spot spacing in group A than group B. The incidence of RG was significantly correlated with age and grouping (P < 0.05).

Conclusions: The upgraded FS200 femtosecond laser with original flap cut parameter settings could increase the incidence of RG. The narrower grating size and lower pulse energy could ameliorate this side effect.

Keywords: FS200 femtosecond laser; Fs-LASIK; Incidence; Rainbow glare.

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Conflict of interest statement

Ethics approval and consent to participate

This study was carried out in accordance with the tenets of the Declaration of Helsinki. It was approved by the Ethics Committee of Peking University Third Hospital. An informed consent was obtained from each subject.

Consent for publication

Not applicable

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
Energy, bed spot and line parameters used for group A and one example of snapshot taken right after the completion of the interface creation
Fig. 2
Fig. 2
Energy, bed spot and line parameters used for group B and one example of snapshot taken right after the completion of the interface creation
Fig. 3
Fig. 3
Incidence rate of rainbow glare in the two groups
Fig. 4
Fig. 4
The fading time of rainbow glare in the two groups
Fig. 5
Fig. 5
Three months post-operation, HRT II corneal confocal microscopy showed comparatively wider laser spot spacing in a group A patient (a) and narrower spot spacing in a group B patient (b) (original magnification 400 × 400 μm)
See this image and copyright information in PMC

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