Corvis ST Tonometer for Measuring Postoperative IOP in LASIK Patients

Hong, Jiaxu; Yu, Zhiqiang; Jiang, Chunhui; Zhou, Xingtao; Liu, Zuguo; Sun, Xinghuai; Xu, Jianjiang

doi:10.1097/opx.0000000000000575

Cited by 21 publications

(24 citation statements)

References 18 publications

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“…In the matter of comparison between IOPg and IOP GAT after corneal refractive surgery, our result showed that there was no significant difference between IOPg and IOP GAT . That was consistent with most previous studies [3,[14][15][16][17]19] . In addition, almost all studies have suggested that IOP GAT was highly dependent on corneal thickness [14,[18][19][20] , so it was reasonable to believe that IOPg was also associated with corneal thickness.…”

Section: Discussionsupporting

confidence: 94%

“…In terms of the comparison between IOPcc and IOP GAT after corneal refractive surgery, our study showed that IOPcc was 2.56 mmHg higher than IOP GAT in general, and the difference between IOPcc and IOP GAT was statistically significant. The relationship between IOPcc and IOP GAT after surgery was also consistent with the existing studies [14][15][16][17]21] . This might be because IOPcc was a measurement of IOP that removed the effect of corneal thickness [21] .…”

Section: Discussionsupporting

confidence: 90%

“…The QUADAS2 tool was applied to assess for bias and the quality evaluation results of the included literatures are shown in Fig 2. The reference standard in five articles was highly biased [12-14, 17, 18] and the patient selection in only one article was highly biased [17] . For flow and timing, all literatures showed lowly biased [12][13][14][15][16][17][18][19] . In general, the quality of the included literatures is relatively high.…”

Section: Quality Assessmentmentioning

confidence: 99%

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Comparison of intraocular pressure measured by ocular response analyzer and Goldmann applanation tonometer after corneal refractive surgery: a systematic review and meta-analysis

Zhang

Sun

et al. 2019

Preprint

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Background: Accurate measurement of intraocular pressure (IOP) after corneal refractive surgery is of great significance to clinic, and comparisons among various IOP measuring instruments are not rare, but there is a lack of unified analysis. GAT is currently the internationally recognized gold standard for IOP measurement, while ORA is said to take into account the biomechanical properties of cornea. In this study, we conducted this meta-analysis to systematically assess the differences and similarities of IOP values measured by ORA and GAT in patients after corneal refractive surgery from the perspective of evidence-based medicine. Methods: The authors searched electronic databases (MEDLINE, EMBASE, Web of science, Cochrane library and Chinese electronic databases of CNKI and Wanfang) from Jan 2005 to Jan 2019, studies describing IOP comparisons measured by GAT and ORA after corneal refractive surgery were included. Quality assessment, subgroup analysis, meta-regression analysis and publication bias analysis were applied in succession. Results: Among the 273 literatures initially retrieved, 8 literatures (13 groups of data) with a total of 724 eyes were included in the meta-analysis, and all of which were English literatures. In the pooled analysis, the weighted mean difference (WMD) between IOPcc and IOPGAT was 2.67 mmHg (95% CI: 2.20~3.14 mmHg, p < 0.0001), the WMD between IOPg and IOPGAT was -0.27 mmHg (95% CI: -0.70~0.16 mmHg, p = 0.2174). In the subgroup analysis of postoperative IOPcc and IOPGAT, the heterogeneity among the data on surgical procedure was zero, while the heterogeneity of other subgroups was still more than 50%. The comparison of mean-∆IOP is: mean-∆IOPg > mean-∆IOPGAT > mean-∆IOPcc. Conclusions: IOPcc may be more close to the true IOP after corneal refractive surgery compared with IOPg and IOPGAT, and the recovery of IOPcc after corneal surface refractive surgery may be more stable than that after lamellar refractive surgery. Keywords: corneal refractive surgery; intraocular pressure; ocular response analyzer; Goldmann applanation tonometer; meta-analysis;

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Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 90%

Section: Quality Assessmentmentioning

confidence: 99%

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Comparison of intraocular pressure measured by ocular response analyzer and Goldmann applanation tonometer after corneal refractive surgery: a systematic review and meta-analysis

Zhang

Sun

et al. 2019

Preprint

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“…For instance, some evidence suggests that readings obtained using Corvis ST are less affected by LASIK‐induced corneal biomechanical changes than those obtained using ORA (Hong et al. ).…”

Section: Discussionmentioning

confidence: 99%

Latanoprost treatment differentially affects intraocular pressure readings obtained with three different tonometers

Sánchez-Barahona

Bolívar

Katsanos

et al. 2019

Acta Ophthalmologica

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Purpose: To evaluate the apparent intraocular pressure (IOP) change observed after treatment with latanoprost in naive eyes of patients with primary open-angle glaucoma (POAG) or ocular hypertension (OHT) using Goldmann applanation tonometer (GAT), ocular response analyzer (ORA) and Corvis ST tonometry. Methods: Prospective observational cohort study. One eye from each of 59 newly diagnosed patients with POAG or OHT in our institution was analysed. IOP readings obtained using GAT, ORA and Corvis at baseline and after a 3month period of treatment with latanoprost were compared. Additionally, preand post-treatment biomechanical corneal parameters provided by the Corvis tonometer were analysed. Results: There was no statistically significant difference between the apparent treatment-induced IOP reductions when GAT and ORA were compared (p > 0.05). In contrast, the treatment-induced IOP reduction recorded using the Corvis tonometer was significantly smaller compared to the apparent IOP reduction observed with GAT and ORA (p = 0.0001 for both comparisons). With respect to biomechanical corneal properties, statistically significant changes were found after 3 months of treatment with latanoprost for the first corneal applanation time (AT1) (p = 0.001), second corneal applanation time (AT2) (p = 0.001) and deformation amplitude (DA) (p = 0.0003). Conclusion: Following a 3-month course of latanoprost, the apparent treatmentinduced IOP reduction in previously na€ ıve patients with POAG or OHT differed depending on the tonometer used. Certain corneal biomechanical parameters assessed using Corvis ST exhibited a significant change. The ocular hypotensive effect of prostaglandin analogues may be overestimated when chronically treated patients are measured using GAT or ORA.

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“…In addition, they found ablation depth was correlated with ΔCRF and ΔCH. It is also reported that CST and GAT would underestimate IOP following LASIK procedure [24]. The underlying reasons for these discrepancies may be the difference in surgical techniques and their efforts on corneal biomechanical structure.…”

Section: Discussionmentioning

confidence: 99%

Changes in intraocular pressure values measured with noncontact tonometer (NCT), ocular response analyzer (ORA) and corvis scheimpflug technology tonometer (CST) in the early phase after small incision lenticule extraction (SMILE)

Shen

Su²,

Liu³

et al. 2016

BMC Ophthalmol

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BackgroundCorneal biomechanical properties are always compromised after corneal refractive surgeries thus leading to underestimated intraocular pressure (IOP) that complicates the management of IOP. We investigated the changes in postoperative baseline of IOP values measured with noncontact tonometer (NCT), ocular response analyzer (ORA) and corvis scheimpflug technology (CST) in the early phase after small incision lenticule extraction (SMILE).MethodsTwenty-two eyes (−6.76 ± 1.39D) of 22 moderate and high myopes, (28.36 ± 7.14 years, 12 male and 10 female) were involved in this prospective study. IOP values were measured using a non-contact tomometer (NCT-IOP), an ocular response analyzer (corneal-compensated IOP, IOPcc and Goldmann-correlated IOP, IOPg) and a Corvis scheimpflug technology tonometer (CST-IOP) preoperatively, at 20 min and 24 h, postoperatively. Repeated measures analysis of variance (RM-ANOVA), Pearson’s correlation analysis and multiple linear regression models (stepwise) were performed. Cut-off P values were 0.05.ResultsExcept for IOPcc, NCT-IOP, IOPg, and CST-IOP values significantly decreased after SMILE procedure (All P values <0.05). ΔCCT, as well as ΔMRSE and ΔKm, did not significantly correlated with ΔNCT-IOP, ΔIOPcc, ΔIOPg or ΔCST-IOP, (all P values >0.05). Multiple linear regression models (stepwise) showed that the practical post-operative IOP value was the main predictor of the theoretical post-operative NCT-IOP, IOPcc and IOPg values (all P values <0.001). The postoperative applanation time 1 (AT1) value (B = 8.079, t = 4.866, P < 0.001), preoperative central corneal thickness (CCT) value (B = 0.035, t = 2.732, P = 0.014) and postoperative peak distance (PD) value (B = 0.515, t = 2.176, P = 0.043) were the main predictors of the theoretical post-operative CST-IOP value.ConclusionsIOP values are underestimated when assessed after SMILE by using NCT-IOP, IOPg and CST-IOP. The practical postoperative IOPcc value and theoretical post-operative CST-IOP value may be more preferable for IOP assessment in the early phase after SMILE.Trial registrationCurrent Controlled Trials ChiCTRONRC13003114. Retrospectively registered 17 March 2013

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Corvis ST Tonometer for Measuring Postoperative IOP in LASIK Patients

Abstract: The CST offers an alternative method for measuring postoperative IOP in LASIK patients, and it appears to obtain higher IOP values than other tonometry techniques. The technique may facilitate the investigation of corneal biomechanical property changes in LASIK-treated eyes.

Cited by 21 publications

References 18 publications

Comparison of intraocular pressure measured by ocular response analyzer and Goldmann applanation tonometer after corneal refractive surgery: a systematic review and meta-analysis

Comparison of intraocular pressure measured by ocular response analyzer and Goldmann applanation tonometer after corneal refractive surgery: a systematic review and meta-analysis

Latanoprost treatment differentially affects intraocular pressure readings obtained with three different tonometers

Changes in intraocular pressure values measured with noncontact tonometer (NCT), ocular response analyzer (ORA) and corvis scheimpflug technology tonometer (CST) in the early phase after small incision lenticule extraction (SMILE)

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