Central corneal thickness measurement with the Pentacam Scheimpflug system, optical low-coherence reflectometry pachymeter, and ultrasound pachymetry

Barkana, Yaniv; Gerber, Yariv; Elbaz, Uri; Schwartz, Shulamit; Ken‐Dror, Gie; Avni, Isaac; Zadok, David

doi:10.1016/j.jcrs.2005.03.058

Cited by 279 publications

(238 citation statements)

References 24 publications

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“…It has been used in the assessment of cataract 6 and for measuring corneal curvature and thickness. 7 From the images acquired, information regarding the anterior and posterior corneal elevation, pachymetry, asphericity, anterior chamber depth, angle and lens density can be measured quickly and noninvasively. Using this device, we can obtain important data, which are required for early diagnosis, followup and surgical planning in keratoconus patients.…”

Section: /Jp-journals-10025-1017mentioning

confidence: 99%

Correlation of Anterior Segment Parameters in Keratoconus Patients

Torquetti¹,

Ferrara²,

Ferrara³

et al. 2012

International Journal of Keratoconus and Ectatic Corneal Diseases

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Purpose: To evaluate the corneal asphericity, volume, thickness and keratometry and the correlation among these variables in keratoconus patients. Materials and methods:A total of 1,071 eyes of 810 patients diagnosed with keratoconus were evaluated with a Pentacam (Oculus Optikgerate GmbH). Results: Sixty-six eyes had very mild keratoconus, 269 had mild keratoconus, 465 had moderate keratoconus, 233 had severe keratoconus and 38 had very severe keratoconus. As the severity of disease increases, there is an increment in K and CV values and reduction of Q and TCT. There was a statistically significant difference in values for all parameters, except the CV. The Pearson correlation index showed an inverse correlation between the degree of keratoconus and the asphericity (Q), i.e. the more severe the keratoconus the more negative the Q-value. Only in the very severe group there was no statistically significant correlation between K and Q. There was no correlation between severity of keratoconus and CV. There was an inverse correlation between keratoconus grade and TCT; the more advanced the disease the less the TCT value. Only in the very mild group there was no correlation between K and TCT. Conclusion:The corneal asphericity and pachymetry are inversely correlated to keratometry in keratoconus patients. There is no correlation between CV and severity of keratoconus.

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Section: /Jp-journals-10025-1017mentioning

confidence: 99%

Correlation of Anterior Segment Parameters in Keratoconus Patients

Torquetti¹,

Ferrara²,

Ferrara³

et al. 2012

International Journal of Keratoconus and Ectatic Corneal Diseases

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show abstract

“…Using the Pentacam system, Amano et al (1) found an average corneal thickness of 538±31.3 µm in 54 Japanese subjects, which were in good correlation with ultrasonic and scanning-slit pachymetry. In agreement with these findings, Buehl et al (13) and Barkana et al (14) concluded that the Pentacam is a reproducible, reliable and easy to use non-contact method of measuring CCT. Lackner et al (15) compared the repeatability and reproducibility of CCT with the Pentacam, Orbscan and ultrasound concluding that Pentacam's reproducibility was the highest of all.…”

Section: Discussionmentioning

confidence: 55%

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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“…[13][14][15][16] This method has been reported to have a high degree of intraoperator and interoperator reproducibility. [4] Placement of the probe on the corneal center can lead to operator-dependent errors due to offcenter placement (thicker measurements) , [17,18] indentation (thinner readings) [19] are the drawbacks of pachymeter.…”

Section: Discussionmentioning

confidence: 99%