Posterior corneal surface changes after hyperopic laser in situ keratomileusis

Purpose. To compare the change of anterior corneal higher-order aberrations (HOAs) after laser in situ keratomileusis (LASIK), wavefront-guided LASIK with iris registration (WF-LASIK), femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK), and small incision lenticule extraction (SMILE).Methods. In a prospective study, 82 eyes underwent LASIK, 119 eyes underwent WF-LASIK, 88 eyes underwent FS-LASIK, and 170 eyes underwent SMILE surgery. HOAs were measured with Pentacam device preoperatively and 6 months after surgery. The aberrations were described as Zernike polynomials, and analysis focused on total HOAs, spherical aberration (SA), horizontal coma, and vertical coma over 6 mm diameter central corneal zone.Results. Six months postoperatively, all procedures result in increase of anterior corneal total HOAs and SA. There were no significant differences in the induced HOAs between LASIK and FS-LASIK, while SMILE induced fewer total HOAs and SA compared with LASIK and FS-LASIK. Similarly, WF-LASIK also induced less total HOAs than LASIK and FS-LASIK, but only fewer SA than FS-LASIK (P<0.05). No significant difference could be detected in the induced total HOAs and SA between SMILE and WF-LASIK, whereas SMILE induced more horizontal coma and vertical coma compared with WF-LASIK (P<0.05).Conclusion. FS-LASIK and LASIK induced comparable anterior corneal HOAs. Compared to LASIK and FS-LASIK, both SMILE and WF-LASIK showed advantages in inducing less total HOAs. In addition, SMILE also possesses better ability to reduce the induction of SA in comparison with LASIK and FS-LASIK. However, SMILE induced more horizontal coma and vertical coma compared with WF-LASIK, indicating that the centration of SMILE procedure is probably less precise than WF-LASIK.

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Ocular Surface Changes in Laser in situ Keratomileusis-induced Neurotrophic Epitheliopathy

Journal of Refractive Surgery ◽

10.3928/1081-597x-20041101-08 ◽

2004 ◽

Vol 20 (6) ◽

pp. 803-809 ◽

Cited By ~ 29

Author(s):

Giacomo Savini ◽

Piero Barboni ◽

Maurizio Zanini ◽

Scheffer C G Tseng

Keyword(s):

Ocular Surface ◽

Laser In Situ Keratomileusis ◽

Surface Changes

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Fine lattice lines on the corneal surface after laser in situ keratomileusis (LASIK)

American Journal of Ophthalmology ◽

10.1016/s0002-9394(99)00379-7 ◽

2000 ◽

Vol 129 (3) ◽

pp. 379-380 ◽

Cited By ~ 7

Author(s):

Emmett F Carpel ◽

Keith H Carlson ◽

Susan Shannon

Keyword(s):

Laser In Situ Keratomileusis ◽

Corneal Surface

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Response of the posterior corneal surface to laser in situ keratomileusis for myopia

Journal of Cataract & Refractive Surgery ◽

10.1016/j.jcrs.2004.09.032 ◽

2005 ◽

Vol 31 (1) ◽

pp. 61-71 ◽

Cited By ~ 34

Author(s):

Michael D. Twa ◽

Cynthia Roberts ◽

Ashraf M. Mahmoud ◽

John S. Chang

Keyword(s):

Laser In Situ Keratomileusis ◽

Corneal Surface

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Posterior corneal surface topographic changes after laser in situ keratomileusis are related to residual corneal bed thickness11The authors have no propriety interests in any materials or methods described in this article.

Ophthalmology ◽

10.1016/s0161-6420(99)90083-0 ◽

1999 ◽

Vol 106 (2) ◽

pp. 406-410 ◽

Cited By ~ 119

Author(s):

Zheng Wang ◽

Jiaqi Chen ◽

Bin Yang

Keyword(s):

Laser In Situ Keratomileusis ◽

Corneal Surface

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Comparison of anterior segment changes after femtosecond laser LASIK and SMILE using a dual rotating Scheimpflug analyzer

10.21203/rs.2.9134/v2 ◽

2019 ◽

Author(s):

Bu Ki Kim ◽

Su Joung Mun ◽

Young Hoon Yang ◽

Ji Sun Kim ◽

Jun Hyung Moon ◽

...

Keyword(s):

Femtosecond Laser ◽

Corneal Thickness ◽

Anterior Segment ◽

Anterior Chamber Depth ◽

Laser In Situ Keratomileusis ◽

Corneal Surface ◽

Significant Difference ◽

Sphere Radius ◽

Lenticule Extraction

Abstract Purpose To compare the changes in the anterior segment after femtosecond laser in situ keratomileusis (FS-LASIK) and small incision lenticule extraction (SMILE) using a dual rotating Scheimpflug (DRS) analyzer (Galilei®; Ziemer Ophthalmology, Port, Switzerland). Setting Onnuri smile eye clinic, Seoul, South Korea Design Retrospective Method 218 eyes of 109 patients who underwent FS-LASIK or SMILE for myopic correction were retrospectively studied. Ninety-eight eyes of 49 patients who underwent FS-LASIK were compared to 120 eyes of 60 patients treated with SMILE. A DRS analyzer was used for preoperative and 6-month postoperative anterior segment analyses. Measured variables included the central corneal thickness (CCT), anterior chamber depth (ACD), anterior and posterior keratometry (K), anterior and posterior best-fit sphere radius, and maximum posterior elevation (MPE). Results The estimated lenticule thickness (LT; 87.20 ± 22.87 µm) was significantly thicker in the SMILE group than the ablation depth (69.23 ± 22.24 µm) in the FS-LASIK group. However, there was no significant difference in the CCT decrease using the DRS analyzer. The MPE was significantly increased after both procedures, and there was a statistically significant difference in the change in MPE between the two groups (-1.10 ± 2.12 µm after FS-LASIK; -0.75 ± 2.33 µm after SMILE; p = 0.035). Conclusions The preoperative LT was overestimated using SMILE. Regarding changes in the MPE and posterior K, changes in the posterior corneal surface were greater after FS-LASIK than after SMILE.

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Comparison of anterior segment changes after femtosecond laser LASIK and SMILE using a dual rotating Scheimpflug analyzer

10.21203/rs.2.9134/v3 ◽

2019 ◽

Author(s):

Bu Ki Kim ◽

Su Joung Mun ◽

Young Hoon Yang ◽

Ji Sun Kim ◽

Jun Hyung Moon ◽

...

Keyword(s):

Femtosecond Laser ◽

Corneal Thickness ◽

Anterior Segment ◽

Anterior Chamber Depth ◽

Laser In Situ Keratomileusis ◽

Corneal Surface ◽

Sphere Radius ◽

Lenticule Extraction ◽

Best Fit

Abstract Background: To compare the changes in the anterior segment after femtosecond laser in situ keratomileusis (FS-LASIK) and small incision lenticule extraction (SMILE) using a dual rotating Scheimpflug (DRS) analyzer (Galilei®; Ziemer Ophthalmology, Port, Switzerland).Methods: A total of 218 eyes of 109 patients who underwent FS-LASIK or SMILE for myopic correction were retrospectively studied. Ninety-eight eyes of 49 patients who underwent FS-LASIK were compared to 120 eyes of 60 patients treated with SMILE. A DRS analyzer was used for preoperative and 6-month postoperative anterior segment analyses. Measured variables included the central corneal thickness (CCT), anterior chamber depth (ACD), anterior and posterior keratometry (K), anterior and posterior best-fit sphere radius, and maximum posterior elevation (MPE).Results: After the procedure, the amount of CCT decrease was higher in the SMILE group than in the FS-LASIK group, but it was not statistically significant. The MPE was significantly increased after both procedures (p < 0.001 and p = 0.001 in the FS-LASIK and SMILE groups, respectively), with the amount of elevation being higher after FS-LASIK than after SMILE even though it was not statistically significant. And there was a significant change in the steep and average posterior K in the FS-LASIK group (p = 0.006 and 0.001, respectively), but not in the SMILE group.Conclusions: Regarding changes in the MPE and posterior K, changes in the posterior corneal surface were greater after FS-LASIK than after SMILE.

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