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

Kim, Bu Ki; Mun, Su Joung; Yang, Young Hoon; Kim, Ji Sun; Moon, Jun Hyung; Chung, Young Taek

doi:10.1186/s12886-019-1257-0

Cited by 15 publications

(12 citation statements)

References 33 publications

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“…We found that there were significant decreases in ACD, ACA, and ACV after FS-LASIK in both the low age group and high age group of patients with myopia, consistent with the results of previous studies [ 21 – 24 ], and the ACD became shallower in both two groups approximately to the same degree. Mean preoperative ACD in the high age group of myopia (2.85 ± 0.24 mm) was significantly lower than that of the low age group (3.19 ± 0.23 mm), the reason for which was the decrease in ACD with age [ 25 , 26 ].…”

Section: Discussionsupporting

confidence: 91%

“…The limitations of this study are as follows: First, we only measured the anterior chamber index values of patients 3 months postoperatively, but the literature has followed up the anterior chamber values from 1 week to 6 months after surgery, although they still come to a conclusion that is consistent with ours [ 18 , 21 ]. Second, because this is a retrospective study and did not verify the effect of accommodation on the anterior chamber, relevant prospective studies need to be further improved to explore the effect of accommodation on the anterior segment before and after surgery.…”

Section: Discussionmentioning

confidence: 63%

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Changes in Anterior Chamber After Myopic and Hyperopic FS-LASIK

Wang

Yuan

et al. 2022

Ophthalmol Ther

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Introduction This study evaluated the changes and explored influential factors in the anterior chamber after femtosecond laser-assisted in situ keratomileusis (FS-LASIK) on the basis of patients with different degrees of myopia, refractive status, and age. Methods Patients underwent uneventful FS-LASIK for the treatment of ametropia. All patients with myopia were classified into a low age group (18–40 years) or high age group (> 40 years). Patients in the low age group (18–40 years) were subdivided into myopia and hyperopia groups. According to the preoperative spherical equivalent values, the myopia group was further divided into low myopia, moderate myopia, and high myopia groups. We measured the magnitude of anterior chamber depth (ACD), angle (ACA), volume (ACV), lens rise, central corneal thickness (CCT), and mean pupil power (MPP) of all patients using Sirius (version 3.2, CSO, Italy) before and 3 months post operation. Results A total of 140 eyes of 87 patients were evaluated. The magnitudes of ACD, ACA, and ACV decreased significantly postoperatively in both low age ( P < 0.001, P < 0.001, P < 0.001, respectively) and high age group ( P < 0.001, P < 0.001, P < 0.001, respectively) of patients with myopia, while an increasing tendency of ACD (2.85 ± 0.38 mm preoperatively vs 2.89 ± 0.09 mm postoperatively) and ACA (39.16° ± 7.30° preoperatively vs 39.37° ± 7.68° postoperatively) was found in hyperopia. There was no correlation between different degrees of myopia and the changes in the anterior chamber. Conclusions Anterior chamber parameters decreased significantly and approximately in the same degree in low and high age groups postoperatively, while an increasing tendency of ACD and ACA was found in hyperopia, indicating that it is probably a corneal magnification effect that influences changes in the anterior chamber.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 63%

Changes in Anterior Chamber After Myopic and Hyperopic FS-LASIK

Wang

Yuan

et al. 2022

Ophthalmol Ther

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“…20 This finding was consistent with the previous studies using MMC in different refractive correction surgeries. 32 …”

Section: Discussionmentioning

confidence: 99%

“…20 This finding was consistent with the previous studies using MMC in different refractive correction surgeries. 32 Although contradictory findings were observed with respect to significant changes in the different corneal endothelial indices and MMC exposure and application in the literature, 20,33 similar prospective studies investigating the effect of MMC on corneal endothelium post-refractive correction reveal no differences in the endothelial indices after 6-12 months postoperatively. 20,25 This suggests that we may need longer follow-ups to investigate the long-term safety and efficacy of MMC on corneal endothelium after T-PRK.…”

mentioning

confidence: 99%

Effect of Prophylactic Mitomycin C on Corneal Endothelium Following Transepithelial Photorefractive Keratectomy in Myopic Patients

Al-Mohaimeed

2022

OPTH

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This study investigated the effect of prophylactic mitomycin C (MMC) on corneal endothelium to inhibit corneal haze formation post transepithelial photorefractive keratectomy (T-PRK). Methods: A total of 120 eyes of 60 patients with low, moderate, and high myopia were subjected to T-PRK with intraoperative application of MMC (0.02%) for 30-50s. Patients' files were categorized into three groups according to ablation depths (if ≥100 µm) during T-PRK as follows: (1) Group A -low myopia without MMC, (2) Group B -low myopia with MMC, and (3) Group Cmoderate/high myopia with MMC. Preoperative/surgical parameters and refractive outcomes were documented. Cell density (CD), number of cells (NUM), coefficient of variation, central corneal thickness (CCT), hexagonality (HEX/6A), average cell area (AVG), and its standard deviation (SD) were evaluated using specular microscopy preoperatively and postoperatively. Results: Overall, 119 out of 120 eyes showed significant prevention of corneal haze. Groups A and C showed no significant changes in endothelial CD and NUM. Group B showed a non-significant reduction in CD. However, all three groups showed significant variations in HEX/6A, CCT, AVG, and SD. Conclusion:The MMC application did not significantly affect corneal endothelial density or number and can be used safely and effectively to prevent corneal haze following T-PRK in myopia.

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“…This seems to go hand in hand with trials on ablation depth, overall CT reduction, or LT, which show a higher ablation than expected. 28 – 30 A recently published trial by Luo et al 31 showed significant deviation from targeted stromal reduction in SMILE eyes but fs-LASIK as well. In the SMILE group, the stromal reduction was overestimated by 20.05 ± 5.92 µm and overestimated by 8.21 ± 8.14 µm in fs-LASIK eyes.…”

Section: Discussionmentioning

confidence: 99%