Comparison of Central Corneal Thickness Measurements by Rotating Scheimpflug Camera, Ultrasonic Pachymetry, and Scanning-Slit Corneal Topography

Amano, Shiro; Honda, Nobumitsu; Amano, Yuki; Yamagami, Satoru; Miyai, Takashi; Samejima, Tomokazu; Ogata, Mitsuaki; Miyata, Kazunori

doi:10.1016/j.ophtha.2006.01.063

Cited by 159 publications

(120 citation statements)

References 14 publications

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“…[12][13][14] In this study, corneal topography (Allegro Oculyzer, WaveLight AG, Erlangen, Germany) was conducted with undilated pupils under scotopic conditions by a single experienced technician. Scans were taken in automatic mode with proper quality.…”

Section: Examinationsmentioning

confidence: 99%

“…Maximum keratometry and corneal pachymetry at the thinnest location were recorded at baseline and 1 year after CXL treatment. 13,14 Cone location was determined according to the topographic coordinates of maximum keratometry as follows: central cone (maximum K within the central 3 mm optical zone), paracentral cone (3-5 mm optical zone), and peripheral cone (outside the central 5 mm optical zone).…”

Section: Examinationsmentioning

confidence: 99%

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Factors affecting outcomes of corneal collagen crosslinking treatment

Toprak

Yaylalı

Yıldırım

2013

Eye

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Purpose To assess the effects of preoperative patient characteristics on clinical outcomes of corneal crosslinking (CXL) treatment in patients with progressive keratoconus. Methods This retrospective study comprised 96 eyes of 96 patients who had unilateral CXL treatment for progressive keratoconus. All patients underwent a complete ophthalmological examination and corneal topography at baseline and 1 year. Subgroup analyses were performed according to the age (o30 andZ30 years), gender, preoperative corrected distance visual acuity (CDVA, o0.3 and Z0.3 logMAR (log of the minimum angle of resolution)), preoperative maximum keratometry (K, o54 and Z54 D), baseline topographic cone location (central, paracentral, and peripheral), and preoperative thinnest pachymetry (o450 and Z450 mm) to determine the associations between preoperative patient characteristics and outcomes (changes in visual acuity and maximum keratometry) of CXL treatment. Results In the entire study population, mean CDVA and maximum K significantly improved after CXL treatment (Po0.001). Patients with a preoperative CDVA of 20/40 Snellen equivalent or worse (Z0.3 logMAR) experienced more visual improvement after CXL treatment (Po0.001). However, an age Z30 years and a baseline thinnest pachymetry less than 450 mm were found significantly associated with more flattening in maximum keratometry (P ¼ 0.024, P ¼ 0.005 respectively). Gender, preoperative maximum K, and baseline topographic cone location did not show significant effect on postoperative visual acuity and maximum keratometry (P40.05). Conclusions In patients with progressive keratoconus, age, baseline visual acuity, and baseline thinnest pachymetry seem to affect the success of the CXL treatment.

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Section: Examinationsmentioning

confidence: 99%

Section: Examinationsmentioning

confidence: 99%

Factors affecting outcomes of corneal collagen crosslinking treatment

Toprak

Yaylalı

Yıldırım

2013

Eye

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“…Corneal thickness is important to informed the corneal endothelial cell function, patient candidate of cataract and refractive surgery, and can affect intraocular pressure measurement by Goldmann applanation tonometry becoming an independent risk factor for glaucoma progression (1)(2)(3)(4)(5)(6) . Variations on mesasuremnts represents an important problem because failure to do so may result in misclassification and, thus, an inaccurate assignment of risk.…”

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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“…However, the rotating Scheimpflug camera (Pentacam, Oculus, Inc., Wetzlar, Germany) is considered to be one of the most reliable devices that measures CCT values comparable to ultrasound corneal pachymetry instruments [19,20,21].…”

Section: Introductionmentioning

confidence: 99%