Agreement of ocular response analyzer cornea compensated IOP with corvis ST biomechanical IOP following Femtosecond Laser-assisted LASIK

Salouti, Ramin; Razeghinejad, Reza; Eslami, Gholamreza; Zare, Mousa; Salouti, Kia; Ghoreyshi, Maryam; Nowroozzadeh, Mohammad Hossein

doi:10.1038/s41433-021-01928-w

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…They also found that PRK had lesser postoperative IOP change compared with LASIK. Their findings were consistent with a separate study from Salouti et al [34 ▪ ], which compared ORA and Corvis ST-bIOP tonometers after Femtosecond Laser-assisted LASIK (FS-LASIK) and found that the bIOP method had less variation in IOP after the operation. They also found that the two methods had weak agreement before and after FS-LASIK surgery and should not be used interchangeably.…”

Section: Postoperative Considerationssupporting

confidence: 88%

Refractive surgery for the glaucoma suspect

Hein

Tauber

Shrivastava

2023

Current Opinion in Ophthalmology

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Purpose of reviewThe aim of this study was to provide an update on perioperative considerations in the evaluation and management of patients undergoing primary corneal and intraocular refractive procedures who are at risk for progressive glaucomatous optic neuropathy.Recent findingsThe necessity of a comprehensive baseline assessment prior to refractive procedures with structural and functional testing, along with documentation of preoperative intraocular pressure (IOP) measurements, is highlighted in recent literature. Substantiation of the increased risk of postoperative IOP elevation in keratorefractive procedures in patients with higher baseline IOP and lower baseline CCT, but not necessarily the degree of myopia, has been variably evidenced. Tonometry methods which are less influenced by postoperative corneal structural change should be considered in patients undergoing keratorefractive procedures. Vigilence in postoperative monitoring for progressive optic neuropathy is suggested given evidence of an increased risk of steroid-response glaucoma in these patients. Additional evidence for the IOP-lowering impact of cataract surgery in patients with an increased risk of glaucoma is provided, irrespective of intraocular lens choice.SummaryPerforming refractive procedures on patients at risk for glaucoma remains controversial. Definitive steps to optimize patient selection along with vigilance in disease state monitoring with longitudinal structural and functional testing can help mitigate potential adverse events.

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Section: Postoperative Considerationssupporting

confidence: 88%

Refractive surgery for the glaucoma suspect

Hein

Tauber

Shrivastava

2023

Current Opinion in Ophthalmology

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“…Furthermore, in terms of evaluating the impact of biomechanical parameters, the software versions have been changed several times with new parameters. The newer Corvis ST version (1.6r2042) includes the biomechanically corrected IOP (bIOP) ( Joda et al, 2015 ; Salouti et al, 2022 ) and DCR parameters like max inverse radius (MIR), deformation amplitude ratio (DARM) [1 mm], deformation amplitude ratio (DARM) [2 mm], pachy slope (PS), Ambrosio relational thickness to the horizontal profile (ARTh), integrated radius (IR), stiffness parameter at applanation 1 (SP-A1) ( Jędzierowska and Koprowski, 2019 ), and Corvis Biomechanical Index (CBI) ( Vinciguerra et al, 2016a ; Vinciguerra et al, 2017a ; Vinciguerra et al, 2017b ). For diagnosis and follow-up purposes, the reliability of these measurements is important, and its evaluation is carried out by analyzing repeatability and reproducibility factors.…”

Section: Introductionmentioning

confidence: 99%

In Vivo Corneal Biomechanical Properties in a Selected Chinese Population, Measured Using the Corneal Visualization Scheimpflug Technology

Tian

Guo

et al. 2022

Front. Bioeng. Biotechnol.

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Purpose: To evaluate the repeatability and reproducibility of recalculated dynamic corneal response (DCR) parameters and the biomechanical-compensated intraocular pressure (bIOP) derived from the Corneal Visualization Scheimpflug Technology (Corvis ST), as well as to study the variations of DCR parameters and their relationship with demographic, and ocular characteristics.Methods: A total of 544 healthy subjects were recruited in this study and a series of ophthalmological examinations were performed on their right eyes. Three repeated measurements were obtained at 3-min intervals for 291 of the participants to ensure repeatability. A sum of 100 participants was examined twice within 2-h intervals using two different Corvis ST in the reproducibility study. The repeatability and reproducibility of 37 parameters, including 36 DCR parameters and bIOP, were assessed by the coefficient of repeatability (CR), coefficient of variation (CV), intraclass correlation coefficient (ICC), and within-subject standard deviation (sw). Pearson’s correlation coefficients and stepwise multivariate linear regression models were performed to investigate whether the DCR parameters were related to demographic and ocular characteristics.Results: Of all the 37 parameters, 34 showed excellent (ICC ≥0.90) or good (ICC ≥0.75) repeatability while 27 of the 37 parameters showed excellent (ICC ≥0.90) or good (ICC ≥0.75) reproducibility. In particular, a CV of less than 20% was found for all DCR parameters and bIOP. A fraction of 14 out of 36 DCR parameters was selected for correlation analysis, based on measurement reliability and clinical relevance in referring to previous literature. Age was negatively associated with the Highest concavity delta arc length (HCdArcL) and peak distance (PD) but it positively correlated with the Whole Eye Movement Max Length (WEMML). Intraocular pressure (IOP) and central corneal thickness (CCT) were negatively associated with the deformation amplitude ratio (DARM) [1 mm], A1 Velocity (A1V), and PD, while positively related to the stiffness parameter at applanation 1 (SP-A1). The bIOP was negatively associated with A1V but positively associated with A2 Velocity (A2V). The anterior chamber volume (ACV) was negatively associated with the pachy slope (PS), WEMML, and SP-A1.Conclusion. The Corvis ST showed good precision for the repeatability and reproducibility of 36 DCR parameters and bIOP parameters in healthy eyes. The IOP, CCT, bIOP, Km, and ACV significantly influenced the DCR parameters of the eyes.

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“…To date, the ORA and Corvis ST are the only two clinically available devices for corneal biomechanics calculation, and both instruments have been used widely in the clinic for the diagnosis of corneal pathologies (keratoconus [157] , [158] , glaucoma [156] , [159] ) and evaluation of medical or surgical treatment (e.g., refractive surgery [160] and CXL [161] , [162] ). However, these two clinical instruments suffer from several limitations.…”

Section: Methods Of In Vivo Corneal Biomechanics A...mentioning

confidence: 99%