Accuracy and predictability of the compensatory function of Orbscan II in intraocular pressure measurements after laser in situ keratomileusis

Lee, Do‐Hyung; Seo, Se-Jung; Shin, Soo-Cheol; Chung, Eui–Hong; Turner, Tim T

doi:10.1016/s0886-3350(01)01286-x

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…63,64 Orbscan assessment of the anterior angle will not surpass slitlamp examination, yet longitudinal quantification together with pachymetric consideration in Goldmann tonometry may provide a role for Orbscan in glaucoma assessment. 65,66 Screening Eye-Bank Corneas…”

Section: Anterior Chamber Depth and Anterior Iris-lens Surfacementioning

confidence: 99%

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Orbscan computerized topography: Attributes, applications, and limitations

Cairns

McGhee

2005

Journal of Cataract and Refractive Surgery

216

134

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An extensive electronic search was undertaken in January 2004 to identify all relevant peer-reviewed publications on Orbscan slit-scanning/Placido computerized topography. Ninety-one publications were identified. These address elevation topography and best-fit sphere, accuracy and repeatability of anterior and posterior corneal elevation and keratometric maps, comparison of Orbscan-acquired data and Placido-based computerized videokeratography instruments, pachymetry measurement and correlation with ultrasound, screening eye-bank corneas, detection of keratoconus, identifying corneal ectasia after refractive surgery, and miscellaneous applications. Studies were analyzed and critically compared in relation to attributes, applications, and limitations of Orbscan corneal topography. The review highlights advantages of this technique in assessing the cornea in health and disease and after surgery and identifies specific aspects that require further investigation and clarification.

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Section: Anterior Chamber Depth and Anterior Iris-lens Surfacementioning

confidence: 99%

“…105 A crucial future role may be in relation to the monitoring of IOP as using the Orbscan II algorithm to rectify tonometry error in surgically altered corneas has performed well; however, a study related to Goldmann and not pneumatic tonometry might improve reliability. 66 …”

Section: Miscellaneous Applicationsmentioning

confidence: 99%

Orbscan computerized topography: Attributes, applications, and limitations

Cairns

McGhee

2005

Journal of Cataract and Refractive Surgery

216

134

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“…10,11 The Orbscan II system may also help to predict actual intraocular pressure (IOP) values after LASIK and avoid misinterpretation of high IOP values as normal because of a possible compensation with this system. 12 It is possible to measure the posterior corneal surface, posterior keratoconus, 13 and changes in posterior curvature because of radial keratotomy, 14 PRK, 15,16 LASIK,17 or because penetrating keratoplasty 18 can be detected and evaluated. Furthermore, it might be useful when screening donor eyebank eyes, not only for corneal abnormalities, which is at the moment not performed in the absence of a positive clinical history or other significant objective findings of diseases, 19 but also for prior refractive surgery.…”

Section: Q 2005 Ascrs and Escrsmentioning

confidence: 99%

Reliability of Orbscan II topography measurements in relation to refractive status

Rabsilber¹,

Becker²,

Auffarth³

2005

Journal of Cataract and Refractive Surgery

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The repeated Orbscan II measurements showed SD in the micrometer range for anterior elevation and pachymetry but values between 0.48 D and 0.97 D for keratometric data. Patients with astigmatism and especially hyperopia showed significantly higher SD values in peripheral zones for anterior elevation and keratometry, indicating a lower reliability, compared with the emmetropic cohort. However, the different ages of the patients could also be a possible explanation for these findings. Therefore, the Orbscan II seems to be a predictable and useful device for measuring corneal topography.

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“…8 Thus, efforts are being made to obtain precise IOP measurements. [8][9][10] To obtain precise IOP data subsequent to refractive surgery, studies of various parameters that may impact the underestimation of the IOP are of considerable importance. Parameters that have been evaluated include ablation depth, 11 age, 5 preoperative IOP, 11 interstitial tissue fluid, 12 decreased corneal resistance to applanation, 13 and corneal curvature.…”

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confidence: 99%

The preoperative intraocular pressure level predicts the amount of underestimated intraocular pressure after LASIK for myopia

Chihara¹

2005

British Journal of Ophthalmology

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Aims: To evaluate the statistical significance of the parameters that affect underestimation of intraocular pressure (IOP) after laser in situ keratomileusis (LASIK) for myopia. Methods: In this prospective case series study, patient age, axial length, preoperative corneal curvature, preoperative central corneal thickness (CCT), preoperative IOP, and ablation depth were studied to determine whether they affect the underestimation of IOP in the right eyes of 100 consecutive patients who underwent LASIK. Results: The preoperative IOP was the most important parameter for an amount of underestimated Goldmann applanation tonometric IOP (GAT) and non-contact tonometric IOP (ncIOP) at 1 month (r = 0.654, p,0.0001, R 2 = 0.427, and r = 0.694, p,0.0001, R 2 = 0.481, respectively) and 3 months (r = 0.637, p,0.0001, R 2 = 0.406, and r = 0.726, p,0.0001, R 2 = 0.527, respectively). Patient age was statistically significant for underestimating the GAT at 1 month, and both the ablation depth and CCT were statistically significant parameters for underestimating the ncIOP at 1 month and at 3 months by stepwise multiple regression analysis (F.4.000). However, these parameters had small bivariate correlation coefficients, and were considered as minor parameters. Conclusion: Preoperative IOP is the most important parameter that affects an underestimation of IOP after LASIK for myopia. Eyes with a higher true IOP have a larger underestimation of the IOP after LASIK for myopia. From these results, the importance of the modulus of elasticity on IOP measurements was discussed.

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Accuracy and predictability of the compensatory function of Orbscan II in intraocular pressure measurements after laser in situ keratomileusis

Abstract: Orbscan II may help predict actual IOP values after LASIK and avoid the misinterpretation of high IOPs as normal IOPs.

Cited by 14 publications

References 16 publications

Orbscan computerized topography: Attributes, applications, and limitations

Orbscan computerized topography: Attributes, applications, and limitations

Reliability of Orbscan II topography measurements in relation to refractive status

The preoperative intraocular pressure level predicts the amount of underestimated intraocular pressure after LASIK for myopia

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