Orbscan Global Pachymetry: Analysis of Repeated Measures

Fam, Han-Bor; Lim, Kooi-Ling; Reinstein, Dan Z.

doi:10.1097/01.opx.0000192348.37026.09

Cited by 38 publications

(36 citation statements)

References 34 publications

(31 reference statements)

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“…30 The current CV w value was more consistent than scanning-slit pachymetry (Orbscan II, Bausch & Lomb), which has CV w values ranging from 0.67% to 0.80%. 27 Regarding the interobserver reproducibility with the Lenstar LS 900 device, we did not find a significant difference between the CCT data obtained by the 2 examiners and the mean difference between a set of measurements was clinically negligible (1.35 mm). However, the interobserver CV w (2.10%) was not as good as the intraobserver CV w value (0.42%).…”

Section: Discussionmentioning

confidence: 77%

Comparison of central corneal thickness using optical low-coherence reflectometry and spectral-domain optical coherence tomography

López-Miguel

Correa-Pérez

Miranda-Anta

et al. 2012

Journal of Cataract and Refractive Surgery

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Section: Discussionmentioning

confidence: 77%

Comparison of central corneal thickness using optical low-coherence reflectometry and spectral-domain optical coherence tomography

López-Miguel

Correa-Pérez

Miranda-Anta

et al. 2012

Journal of Cataract and Refractive Surgery

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“…The pachymetric values variation, observed in both patients groups, remained within the normal limits for the test (24)(25)(26) (Table 1).…”

Section: Discussionmentioning

confidence: 94%

“…In this study, we have compared the central corneal edema of patients submitted to cataract surgery performed with conventional phacoemulsification in one eye and with liquefaction, by Aqualase ® , in the fellow There was no statistically significant difference between the groups considering pre and postoperative corneal thickness average, measured by pachymetry with Orbscan II ® (24) . The pachymetric values variation, observed in both patients groups, remained within the normal limits for the test (24)(25)(26) (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Comparison of central corneal edema and visual recovery between liquefaction and conventional phacoemulsification in soft cataracts

Nakano¹,

Hida²,

Kara‐José³

et al. 2009

Rev. bras.oftalmol.

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Purpose:The aim of the present study is to assess central corneal edema and visual recovery after cataract surgery performed according to two technologies: conventional ultrasonic and liquefaction (Aqualase ® ). Methods: This is a prospective contralateral study in wich 20 patients with comparable preoperative conditions were submitted to cataract surgery were evaluated. Preoperative assessment involved complete ophthalmological examination and the study included patients with bilateral cataracts up to grade 2, according to the Lens Opacity Classification System II. The same cristaline fracture technique was used in all cases, and surgical procedures were performed by the same experienced surgeon, using two technologies: liquefaction or conventional phacoemulsification. Postoperative central corneal edema was measured by corneal optical pachymetry (Orbscan II ® ) on the 1 st , 3 rd , 7 th and 10 th postoperative days. Results: None of the 20 patients submitted to surgery was lost during the postoperative follow-up or excluded from the analysis. On the first postoperative, the visual acuity average was 0.031 logMAR in the Aqualase ® group and 0.043 logMAR in the conventional surgery group. No statistical difference was detected in the assessment of visual acuity throughout the postoperative period. Central corneal pachymetry varied from 543.93 + 34.69 preoperatively to 545.08 ± 25.67 on the last day of follow-up in the Aqualase ® group, and from 543.13 + 30.62 to 536.08 + 34.89 in the conventional technique group, without statistical significance. Conclusion: This study suggests that both techniques are equally effective for surgery on lenses with grade I or II cataract, and that they provide similar results in terms of visual recovery and central corneal edema.

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“…Another well studied non-contact method for measuring CCT is the Orbscan II (Bausch & Lomb, Rochester, NY) (3,10,11,13,16,17) . Giraldez Fernandez et al (10) found that the Orbscan measurement of CCT were greater that ultrasonic pachymeter measurements, a difference that was statistically significantly.…”

Section: Discussionmentioning

confidence: 99%

Repeatability of central corneal thickness measurement with the Pentacam HR system

Alonso¹,

Fontes²,

Ventura³

et al. 2012

Rev. bras.oftalmol.

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Purpose: To assess the repeatability of central corneal thickness measurement at the geometrical center (Central Corneal Thickness -CCT) given by the Pentacam High Resolution (HR) Comprehensive Eye Scanner (Oculus, Wetzlar, Germany) over time. Methods: Prospective, single center, observational study. Two separate CCT measurements were taken by the Pentacam corneal tomography exam (CTm) 3 to 12 months apart, and compared. Results: One hundred and sixteen eyes (n=116) of 62 health patients were included in this study. Average CCT in first and last visits was 541.6±37 µm and 543.6±36.9 µm respectively. Mean difference between both measurements was 9.2±6.4 µm, and there was no statistically significant difference in CCT measurement between visits, with good correlation between them (P = 0.057, r 2 = 0,9209). Conclusion: Pentacam (HR) CTm gives repeatable CCT measurements over time.Keywords: Cornea/anatomy & histology; Corneal topography; Biometry/methods; Reproducibility of results; Diagnostic techniques, ophthalmological/instrumentation RESUMO Objetivo: Avaliar a reprodutibilidade da medida da espessura corneana central, no seu centro geométrico, com medidas obtidas pelo sistema Pentacam de Alta Resolução (HR) com o decorrer do tempo. Métodos: Realizado estudo observacional prospectivo em Centro Oftalmológico. Duas medidas isoladas da espessura central da córnea (ECC) foram realizadas com exame de tomografia do segmento anterior Pentacam HR em períodos com intervalos maiores que 3 e em até 12 meses, sendo então comparadas os resultados. Resultados: Cento e dezesseis olhos (n = 116) de 62 pacientes saudáveis foram incluídos neste estudo. A média das medidas da ECC na primeira e na última avaliação foi de 541,6 ± 37 µm e 543,6 ± 36,9 µm, respectivamente. A diferença média entre as duas medições foi de 9,2 ± 6,4 µm, e não houve diferença estatisticamente significativa das medida da ECC entre as visitas, com boa correlação entre si (P = 0,057, r2 = 0,9209). Conclusão: O Tomógrafo de Segmento Anterior Pentacam HR apresentou medidas de ECC reprodutíveis ao longo do tempo.

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Orbscan Global Pachymetry: Analysis of Repeated Measures

Abstract: Orbscan is capable of giving repeatable pachymetry readings that are comparable to the ultrasound pachymeter within the central and thinnest point of the cornea. There is a gradual loss of repeatability toward the peripheral cornea possibly as a result of a lack of overlapping data points.

Cited by 38 publications

References 34 publications

Comparison of central corneal thickness using optical low-coherence reflectometry and spectral-domain optical coherence tomography

Comparison of central corneal thickness using optical low-coherence reflectometry and spectral-domain optical coherence tomography

Comparison of central corneal edema and visual recovery between liquefaction and conventional phacoemulsification in soft cataracts

Repeatability of central corneal thickness measurement with the Pentacam HR system

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