Comparison of different correction formulas and measurement methods for the accurate determination of intraocular pressure after SMILE and FS-LASIK surgery

Yang, Zhiqing; Miao, Na; Wang, Lixiang; Ma, Ke

doi:10.1186/s12886-022-02620-7

Cited by 3 publications

(8 citation statements)

References 30 publications

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“…Some studies have reported that IOP after LASIK is underestimated 6,10 . IOP reduction after this procedure has been attributed to a reduction in CCT 6,11,10 . However, changes in corneal stiffness after a surgical procedure such as LASIK can be an equally important reason 10 .…”

Section: Discussionmentioning

confidence: 99%

“…Clinical studies and experiments in animal models have shown that keratorefractive surgery does not induce a decrease in IOP, suggesting that the reduced IOP measurements recorded after surgery need to be corrected 11,15 . To minimize GAT biases in post LASIK patients, some authors have postulated that non-contact tonometer is more accurate than the GAT 4,16 .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…The Corvis® ST has recently emerged as a more convenient and faster method to evaluate corneal biomechanics and measure IOP 11 . Only a few studies have compared IOP values before and after corneal refractive surgery, reporting that the IOP obtained with the Corvis® ST is more reliable than the values obtained with other non-contact devices 11 . Some studies report that the biOP proved to be the most stable and accurate parameter after surface ablation or lamellar procedure, in addition to being the one that presents a smaller mean difference in IOP values before and after surgery 7,17,18 .…”

Section: Discussionmentioning

confidence: 99%

“…Femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) involves the creation of a corneal flap by femtosecond laser and corneal reshaping by excimer laser to remove tissue from the underlying stromal bed. Thus, these changes in corneal morphology and biomechanics may affect IOP measurement by several methods patients 4,5,6,7,11 .…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Intraocular Pressure in Eyes After Femtolasik Surgery

Leite,

Ribeiro,

Abreu

et al. 2024

MRAJ

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Introduction: Femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) surgery is a surgical procedure performed in the treatment of refractive errors. Given the changes in central corneal thickness, intraocular pressure may be lower and underestimated, which may lead to a late diagnosis of ocular hypertension/glaucoma. Aims: The aim of this study was to evaluate and compare intraocular pressure, by different methods, before and after FS-LASIK, for correction of myopia or myopic astigmatism. Methods: Retrospective and observational study, which included eyes undergoing FS-LASIK surgery (November 2020 to November 2022). The intraocular pressure values were measured (preoperatively, on the 1st, 3rd and 6th postoperative month) using contact tonometry (Goldmann applanation tonometry) and non-contact tonometry (by Corvis®ST according to the formulas: pachymetry – Ehlers, Shah, Dresden, Spoerl – and biomechanics – corrected and uncorrected). The intraocular pressure values obtained at 6 months with the different methods were compared with the Goldmann applanation tonometry intraocular pressure values obtained at baseline. Results: Ninety patients (of a total of 174 eyes) underwent FS-LASIK, with a preoperative spherical equivalent of -3.7±1.7. Preoperatively (mean ± standard deviation) Goldmann applanation tonometry was 15.0±1.9 mmHg; the intraocular pressure values obtained through the Corvis® ST (in mmHg) according pachymetry: Ehlers (13.5±2.6), Shah (14.3±2.3), Dresden (14.5±2.2) and Spoerl (14.5±2.1); and biomechanics: corrected (14.4±1.9) and not corrected (15.3±2.1), respectively. At 6 months postoperatively, all showed statistically significant differences, with the exception of Shah's formula (p=0.074); comparing the preoperative Goldmann applanation tonometry with each of the formulas at the end of the follow-up, the Ehlers formula did not present statistically significant differences (p=0.434), the Shah formula a value of p=0.047 and the others a value of p<0.001. Conclusion: Femtosecond laser-assisted laser in situ keratomileusis surgery underestimates intraocular pressure measurement by contact tonometry. In non-contact tonometry, at 6-month follow-up, the Shah formula appears to be less influenced by this bias. More studies are needed to evaluate the best method to assess I intraocular pressure measurement after FS-LASIK surgery.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of Intraocular Pressure in Eyes After Femtolasik Surgery

Leite,

Ribeiro,

Abreu

et al. 2024

MRAJ

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The visual outcomes and corneal biomechanical properties after PRK and SMILE in low to moderate myopia

Joshi,

Bari,

Shakkarwal

et al. 2024

Indian Journal of Ophthalmology

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Purpose: To compare the corneal biomechanical parameters, visual outcome, and epithelial remodeling after small-incision lenticule extraction (SMILE) and photorefractive keratectomy (PRK) for low to moderate myopia. Design: Prospective, interventional, randomized, comparative study. Methods: Eighty eyes of 40 patients undergoing bilateral SMILE or PRK for low to moderate myopia (<-5 D SE) were included. They were divided into two groups based on the planned refractive surgery. Visual acuity, corneal biomechanics using Corvis-ST, epithelial mapping via anterior segment optical coherence tomography, and higher-order aberrations were recorded both preoperatively and postoperatively at 6 months and compared. Results: At 6 months follow-up, the corrected distance visual acuity as well as the postoperative spherical equivalent of both the groups were comparable (P = 0.13 and P = 0.32, respectively). The biomechanical parameters like deformation amplitude ratio (P < 0.01), inverse concave radius (P = 0.006), integrated ratio (P < 0.01), stress–strain index (P < 0.01), Ambrosio’s relational thickness (ArTH) (P < 0.01), and corneal biomechanical index-laser vision correction (P = 0.02) were altered more in the SMILE group than in the PRK group, while the biomechanically corrected intraocular pressure (P = 0.16) was comparable. Epithelial remodeling (P = 0.59), higher-order aberrations (P = 0.53), and stromal keratocyte loss (P = 0.16) in both the groups were comparable. Conclusion: Both SMILE and PRK are comparably effective procedures for correction of low to moderate myopia in terms of visual outcomes; however, the corneal biomechanical stability in PRK is superior than that in SMILE.

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Evaluation of corneal biomechanical changes in moderate myopia after different techniques of corneal refractive surgeries

Shady,

Elseht,

Hasby

et al. 2024

Tanta Med J

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Background The most prevalent refractive error, which accounts for between 15 and 49% of cases worldwide, is myopia. Refractive surgery can fix refractive problems and lessen reliance on glasses or contact lenses. Aim This study aims to assess corneal biomechanical alterations following photorefractive keratectomy (PRK) and femtosecond laser small incision lenticule extraction (F-SMILE) in moderate myopic patients using CORVIS-ST (CST). Patients and methods This prospective, comparative, nonrandomized study was conducted on 40 patients’ eyes. with moderate myopia in a private center from January 2020 to December 2020, these eyes were subdivided into two groups: (a) The first group included 20 eyes that will receive PRK (b) The second group included 20 eyes that will receive F-SMILE. All participants will undergo operative (History taking, and examinations), preoperative (PRK, and F-SMILE), and postoperative (medications and Follow-up examinations) evaluations. Results Significant differences existed among the two groups in postoperative follow-up after 1 month and 6 months regarding deformation amplitude, radius, corvis biomechanical index, and intraocular pressure corrected biomechanically but There were insignificant differences among the two groups in terms of SPA in the same periods postoperatively. Conclusion Laser refractive surgery has a major impact on corneal biomechanical properties, as evidenced by significant changes in Corvis ST ocular biomechanical measures following PRK and F-SMILE procedures in myopic patients. The alterations resulting from F-SMILE are more substantial compared with PRK.

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Comparison of different correction formulas and measurement methods for the accurate determination of intraocular pressure after SMILE and FS-LASIK surgery

Cited by 3 publications

References 30 publications

Evaluation of Intraocular Pressure in Eyes After Femtolasik Surgery

Evaluation of Intraocular Pressure in Eyes After Femtolasik Surgery

The visual outcomes and corneal biomechanical properties after PRK and SMILE in low to moderate myopia

Evaluation of corneal biomechanical changes in moderate myopia after different techniques of corneal refractive surgeries

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