Changes in biomechanically corrected intraocular pressure and dynamic corneal response parameters before and after transepithelial photorefractive keratectomy and femtosecond laser–assisted laser in situ keratomileusis

Purpose. To investigate the changes in intraocular pressure (IOP) and biomechanically corrected IOP (bIOP) in patients undergoing transepithelial photorefractive keratectomy (TPRK) and femtosecond laser in situ keratomileusis (FS-LASIK) and to determine the effects of preoperative biomechanical factors on IOP and bIOP changes after FS-LASIK and TPRK. Design. A retrospective comparative study. Methods. We retrospectively investigated the IOP and corneal biomechanical changes in 93 eyes undergoing FS-LASIK and 104 eyes undergoing TPRK in a clinical setting. Preoperative and postoperative data on ophthalmic and Corvis ST examinations, in vivo Young’s modulus, and noncontact tonometry were analyzed. Marginal linear regression models with generalized estimating equations were used for intragroup and intergroup comparisons of IOP and bIOP changes. Results. In the univariate model, IOP reduction after FS-LASIK was 2.49 mmHg higher than that after TPRK. In addition, bIOP reduction after FS-LASIK was 1.85 mmHg higher than that after TPRK. In the multiple regression model, we revealed that IOP reduction after FS-LASIK was 1.75 mmHg higher than that after TPRK. Additionally, bIOP reduction after FS-LASIK was 1.64 mmHg higher than that after TPRK. Postoperative changes in bIOP were less than those in IOP. In addition, Young’s modulus and CBI had no significant effect on postoperative IOP and bIOP changes. We establish a biomechanically predictive model using the available data to predict postoperative IOP and bIOP changes after TPRK and FS-LASIK. Conclusions. Reductions in IOP and bIOP after FS-LASIK were 1.75 mmHg and 1.64 mmHg, respectively, more than those after TPRK, after adjustment for confounders. We revealed that the type of refractive surgery and peak distance (PD) were significant predictors of postoperative IOP and bIOP changes. By contrast, depth of ablation showed a significant effect on only IOP changes.

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Evaluation of the change in retinal thickness after femtosecond laser-assisted laser in situ keratomileusis and photorefractive keratectomy

Current Eye Research ◽

10.1080/02713683.2021.1951297 ◽

2021 ◽

pp. 1-7

Author(s):

Cemal Ozsaygili ◽

Orhan Altunel ◽

Necati Duru

Keyword(s):

Femtosecond Laser ◽

Retinal Thickness ◽

Laser In Situ Keratomileusis ◽

Photorefractive Keratectomy

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Comparison of Intraocular Pressure before and after Laser In Situ Keratomileusis Refractive Surgery Measured with Perkins Tonometry, Noncontact Tonometry, and Transpalpebral Tonometry

Journal of Ophthalmology ◽

10.1155/2015/683895 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Isabel Cacho ◽

Juan Sanchez-Naves ◽

Laura Batres ◽

Jesús Pintor ◽

Gonzalo Carracedo

Keyword(s):

Intraocular Pressure ◽

Refractive Surgery ◽

Corneal Thickness ◽

Laser In Situ Keratomileusis ◽

Spherical Equivalent ◽

Transpalpebral Tonometry ◽

Spherical Equivalent Refraction ◽

Before And After ◽

Noncontact Tonometry

Purpose. To compare the intraocular pressure (IOP) before and after Laser In Situ Keratomileusis (LASIK), measured by Diaton, Perkins, and noncontact air pulse tonometers.Methods. Fifty-seven patients with a mean age of 34.88 were scheduled for myopia LASIK treatment. Spherical equivalent refraction (SER), corneal curvature (K), and central corneal thickness (CCT) and superior corneal thickness (SCT) were obtained before and after LASIK surgery. IOP values before and after surgery were measured using Diaton, Perkins, and noncontact air pulse tonometers.Results. The IOP values before and after LASIK surgery using Perkins tonometer and air tonometers were statistically significant (p<0.05). However, no significant differences were found (p>0.05) for IOP values measured with Diaton tonometer. CCT decreases significantly after surgery (p<0.05) but no statistical differences were found in SCT (p=0.08). Correlations between pre- and postsurgery were found for all tonometers used, withp=0.001andr=0.434for the air pulse tonometer,p=0.008andr=0.355for Perkins, andp<0.001andr=0.637for Diaton.Conclusion. Transpalpebral tonometry may be useful for measuring postsurgery IOP after myopic LASIK ablation because this technique is not influenced by the treatment.

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Intraocular pressure rises during laser in situ keratomileusis: Comparison of 3 femtosecond laser platforms

Journal of Cataract & Refractive Surgery ◽

10.1016/j.jcrs.2019.03.013 ◽

2019 ◽

Vol 45 (8) ◽

pp. 1172-1176 ◽

Cited By ~ 2

Author(s):

Gema Bolivar ◽

Montserrat Garcia-Gonzalez ◽

Gorka Laucirika ◽

Cesar Villa-Collar ◽

Miguel A. Teus

Keyword(s):

Intraocular Pressure ◽

Femtosecond Laser ◽

Laser In Situ Keratomileusis

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Changes in Biomechanical Properties of the Cornea and Intraocular Pressure After Myopic Laser In Situ Keratomileusis Using a Femtosecond Laser for Flap Creation Determined Using Ocular Response Analyzer and Goldmann Applanation Tonometry

Journal of Glaucoma ◽

10.1097/ijg.0b013e31829da1ec ◽

2015 ◽

Vol 24 (3) ◽

pp. 195-201 ◽

Cited By ~ 17

Author(s):

Jonghoon Shin ◽

Tae Won Kim ◽

Soo Jeong Park ◽

Min Yoon ◽

Ji Woong Lee

Keyword(s):

Intraocular Pressure ◽

Femtosecond Laser ◽

Biomechanical Properties ◽

Applanation Tonometry ◽

Goldmann Applanation Tonometry ◽

Laser In Situ Keratomileusis ◽

Ocular Response Analyzer ◽

Flap Creation

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Accommodation Amplitude Before and After Laser In Situ Keratomiletus (LASIK) In Myopic Patients

Sriwijaya Journal of Ophthalmology ◽

10.37275/sjo.v3i1.43 ◽

2020 ◽

Vol 3 (1) ◽

pp. 1-18

Author(s):

Bonita Asyigah ◽

Ani Ismail

Keyword(s):

Visual Acuity ◽

Intraocular Pressure ◽

Refractive Surgery ◽

Laser In Situ Keratomileusis ◽

Adaptation Mechanism ◽

Near Vision ◽

Before And After ◽

Center Hospital

ABSTRACT Introductions: Laser in situ Keratomileusis (LASIK) is the most common refractive surgery to treat myopia. One of the most common complain after this procedure is blurry near- vision. Objectives: To evaluate the role of accommodation amplitude (AA) in myopic patients before and after LASIK and its effect to blurry near-vision in myopic patients after LASIK Methods: Patients with myopia who underwent LASIK procedure in Sriwijaya Eye Center Hospital from January to February 2018 studied prospectively. AA was assessed before and after LASIK with 1 day, 1 week and 1 month. Myopia degree, intraocular pressure (IOP), age, gender, ablation and corneal profile were also assessed. Results: A total 52 eyes from 32 patients were included. Visual acuity (VA) of all sample were significantly improve in 1 day after LASIK (p 0,001). Mean AA in myopic patients before LASIK 9,25 D and AA 1 day after LASIK were all significantly decrease into 9,00D (p 0,012) which can cause in blurry near- vision after LASIK. In 1 month followed-up, mean AA is significantly improved into 11,00 D (p 0,000) with no complain. Other factor that affect the changing AA were corneal cell density (CD), IOP and AA before LASIK. Conclusions: There is significant AA difference in myopic patients before and after LASIK. Blurry near-vision after LASIK is caused by AA adaptation mechanism after LASIK.

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Effect of Transepithelial Photorefractive Keratectomy without Mitomycin C in the Treatment of Femtosecond Laser In Situ Keratomileusis Corneal Flap Complications

Journal of Ophthalmology ◽

10.1155/2021/8847922 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Jing Wang ◽

Weiqian Cao ◽

Liming Tao

Keyword(s):

Visual Acuity ◽

Femtosecond Laser ◽

Mitomycin C ◽

Laser In Situ Keratomileusis ◽

Photorefractive Keratectomy ◽

Distance Visual Acuity ◽

Uncorrected Distance Visual Acuity ◽

Haze Formation

Purpose. To assess the efficacy and safety of transepithelial photorefractive keratectomy (TPRK) without mitomycin C as treatment for femtosecond laser in situ keratomileusis (FS-LASIK) corneal flap complications. Methods. Eight patients with corneal flap complications that occurred after FS-LASIK (five with eccentric flaps, two with buttonhole flaps, and one with a thick flap) were included in the study. Patients were treated with TPRK without mitomycin C between two weeks and twelve months after surgery. The postoperative manifest refraction, uncorrected distance visual acuity, and haze formation were assessed during six months of follow-up. Results. The mean manifest refractive spherical and cylinder refraction was 0.16 ± 0.26 and −0.44 ± 0.33 diopters, respectively, at six months postoperatively. The uncorrected distance visual acuity was above 20/25 in all patients after six months of follow-up. No haze formation was detected. Conclusions. TPRK without mitomycin C appears to be a safe and effective treatment for FS-LASIK corneal flap complications.

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