Repeatability and Agreement of 2 Scheimpflug Analyzers in Measuring the Central Corneal Thickness and Anterior Chamber Angle, Volume, and Depth

Bedei, Andrea; Appolloni, Ilaria; Madesani, Antonio; Pietrelli, Alessia; Franceschi, Sara; Barabesi, Lucio

doi:10.5301/ejo.5000102

Cited by 18 publications

(17 citation statements)

References 20 publications

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“…We used the built-in measurement tool and performed a plausibility check for inappropriate values. The built-in measurement tool reliably measures the ACA, 26 but coefficient of repeatability was reported to be 65.458. 27 This means that 95% of the repeated measures were within a difference of 5.458.…”

Section: Discussionmentioning

confidence: 99%

Distribution of Anterior Chamber Angle Width and Correlation With Age, Refraction, and Anterior Chamber Depth—The Gutenberg Health Study

Schuster

Pfeiffer

Nickels

et al. 2016

Invest. Ophthalmol. Vis. Sci.

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PURPOSE.Scheimpflug imaging allows quantitative analysis of the width of the anterior chamber angle. We report the population-based distribution of the anterior chamber angle width using this noncontact imaging technique and investigate associated factors. METHODS.A population-based cross-sectional study was carried out in Germany. A comprehensive ophthalmologic examination including refraction, biometry, and Scheimpflug imaging was performed. Automated measurement of the anterior chamber angle was performed in each anterior chamber quadrant. Exclusion criteria were previous ocular surgery or inadequate image quality. Association analyses were carried out to determine independently associated systemic and ocular factors for anterior chamber angle width using a generalized estimating equation model. RESULTS.A total of 3014 subjects (48% female) with a mean age of 58.6 6 10.4 years were included in this study. The mean anterior chamber angle width was 32.68 6 5.58. Statistical analysis revealed an independent association between a smaller anterior chamber angle and female sex, higher age, and more hyperopic refraction. When including biometric parameters, shallow anterior chamber depth, shorter axial length, higher central corneal thickness, and lower corneal power were independently associated with a narrower mean anterior chamber angle width.CONCLUSIONS. These parameters are considered risk factors for angle-closure glaucoma.Keywords: Scheimpflug photography, epidemiology, anterior chamber angle, refraction, anterior chamber depth A nterior chamber angle and depth have been identified as an important risk factor for angle-closure glaucoma 1 and progression of open-angle glaucoma.2 For almost a century, gonioscopy has been used to semiquantitatively analyze anterior chamber angle width. [3][4][5] More recently, quantitative imaging modalities including ultrasound biomicroscopy, optical coherence tomography, and Scheimpflug imaging have been developed. [6][7][8] In contrast to ultrasound biomicroscopy, optical coherence tomography and Scheimpflug imaging offer noncontact imaging of the anterior segment and make these methods attractive for patients and doctors alike. 9 To interpret measurements from Scheimpflug imaging and to integrate the results into a clinical context, it is important to know the distribution of anterior chamber angle width and to understand associations with clinical factors. The underlying idea is that a narrower anterior chamber angle width is associated with clinically suspicious risk factors for acute angle closure, namely female sex, older age, hyperopic refraction, shorter axial length, and thicker crystalline lens.Hence, the focus of this study is to derive normative values of the anterior chamber angle width. Using Scheimpflug imaging we investigate, for the first time, correlations between anterior chamber angle width and systemic and ocular parameters in a very large population-based setting. MATERIALS AND METHODSThe Gutenberg Health Study (GHS) is a prospective, populationbased, obs...

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Section: Discussionmentioning

confidence: 99%

Distribution of Anterior Chamber Angle Width and Correlation With Age, Refraction, and Anterior Chamber Depth—The Gutenberg Health Study

Schuster

Pfeiffer

Nickels

et al. 2016

Invest. Ophthalmol. Vis. Sci.

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“…Some studies have assessed the repeatability of various anterior segment measurements provided by the same Scheimpflug imaging-based system as that used in the current study [6][7][8][9][10], with most reporting high levels of consistency [10][11][12][13][14]. However, few works have studied the repeatability of IA measurements [8], and to date, there is no study validating the consistency of measurements provided by the glaucoma mode of the Scheimpflug imagingbased system used in our series.…”

Section: Discussionmentioning

confidence: 99%

“…One example of a system providing non-invasive measurement of the IA is the Sirius ® system (Costruzione Strumenti Oftalmici [CSO], Florence, Italy), a non-contact 3D rotating Scheimpflug camera combined with a Placido ring that provides different anatomical measurements of the anterior segment. While there is strong scientific evidence of the consistency and repeatability of anterior segment measurements provided by this system in healthy and even pathological eyes [6][7][8][9][10][11][12][13][14][15], evidence of the repeatability of IA measurements is limited [8]. Likewise, to the best of our knowledge, no studies have evaluated and compared the consistency of IA measurements at different nasal and temporal meridians using this device.…”

Section: Introductionmentioning

confidence: 99%

Intra-session repeatability of iridocorneal angle measurements provided by a Scheimpflug photography-based system in healthy eyes

Ruiz-Belda¹,

Piñero

Ruiz-Fortes³

et al. 2015

Graefes Arch Clin Exp Ophthalmol

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“…8,17,18 Yine de çalışmamızda kontrol grubunun bulunmayışı bu açıdan kısıtlayıcı bir unsur olarak değerlendirilebilir. Ancak PAKŞ grubunda dahi olsa tanı konulan olguların, periferik iridotomi uygulamaksızın kontrol grubu olarak takibinin etik açıdan doğru olmayacağı düşünülmüştür.…”

Section: Discussionunclassified

Evaluation of the Changes in Anterior Segment Morphology After Laser Peripheral Iridotomy Through One-Year Follow-Up

Yiğit¹,

Onur²,

Acet³

et al. 2014

tjo

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Amaç:Primer açı kapanması şüphesi (PAKŞ), primer açı kapanması (PAK) ve primer açı kapanması glokomu (PAKG) tanısıyla laser periferik iridotomi (LPİ) yapılan gözlerde ön segment morfolojisinde meydana gelen uzun süreli değişikliklerin Scheimpflug kamera (SK) ile değerlendirilmesi. Gereç ve Yöntem: PAKŞ, PAK ve PAKG tanısı alan 30 hastanın 50 gözü prospektif olarak çalışmaya alındı. Tüm olguların tam oftalmik muayene ve göz içi basıncı (GİB) ölçümüne ek olarak gözlerin ön-arka uzunluğu (AU) kaydedildi. LPİ öncesi ve LPİ sonrası 1. ay, 3. ay, 6. ay, 12. ay kontrollerinde SK ile ortalama ön kamara açısı (OÖKA), santral ön kamara derinliği (SÖKD) ve ön kamara hacmi (ÖKH) ölçüldü. Sonuçlar istatistiksel olarak değerlendirildi. Bulgular: Gruplar arasında yaş ortalamaları, cinsiyet ve (AU) bakımından istatistiksel olarak anlamlı fark saptanmadı (p>0,05). OÖKA, SÖKD ve ÖKH ölçümleri tüm gruplarda başlangıç ile 1., 3., 6., 12. aylar arasında istatistiksel olarak anlamlı azalma gösterdi (p<0,05). OÖKA; PAKŞ grubunda 6. ve 12. ay; PAK ve PAKG grubunda 1. ve 12., 3. ve 12., 6. ve 12. aylar arasında istatistiksel olarak anlamlı azalma gösterdi (p<0,05). SÖKD ölçümleri PAK grubunda 6. ve 12. aylar arası, PAKG grubunda 3. ve 6. aylar ile 3. ve 12. aylar arasında istatistiksel olarak anlamlı azalma gösterdi (p<0,05). ÖKH, PAK grubunda 6. ve 12. aylar arası, PAKG grubunda 1. ve 12. aylar ile 3. ve 12. aylar arasında ölçümlerde azalma istatistiksel olarak anlamlıydı (p<0,05). Sonuç: LPİ uygulaması ön segment morfolojisinde dramatik değişiklikler oluşturur. Çalışmamızda, LPİ ile oluşturulan değişimlerin seyri SK ile bir yıl süreyle izlenmiştir. Erken dönemde tüm parametreleri olumlu etkilediği gözlenmiştir. Ölçümlerin seyrindeki eğilimlerin devamlılık gösterip göstermediği daha uzun süreli daha geniş seriler ile izlenmelidir. (Turk J Ophthalmol 2014; 44: 6-10) Anahtar Kelimeler: Laser periferik iridotomi, primer açı kapanması şüphesi, primer açı kapanması, primer açı kapanması glokomu, Scheimpflug kamera Objectives: To evaluate the long-term changes in anterior segment morphology after laser peripheral iridotomy (LPI) in eyes with primary angle-closure suspect (PACS), primary angle closure (PAC), and primary angle-closure glaucoma (PACG) using Scheimpflug camera (SC). Materials and Methods: Fifty-six eyes of 30 patients diagnosed as PACS, PAC, and PACG were included prospectively in this study. In addition to full ophthalmic examination and intraocular pressure (IOP) assessment, anterior-posterior length (AxL) values of the eyes were recorded. With use of SC, average anterior chamber angle (AACA), central anterior chamber depth (CACD), and anterior chamber volume (ACV) were documented preoperatively and at 1 month, 3 months, 6 months, and 12 months after LPI. The results have been evaluated statistically. Results: There was no statistically significant difference between the groups in terms of mean age, gender, and AxL (p>0.05). AACA, CACD, and ACV measurements showed significant difference between baseline and months 1.3, 6, and ...

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Repeatability and Agreement of 2 Scheimpflug Analyzers in Measuring the Central Corneal Thickness and Anterior Chamber Angle, Volume, and Depth

Abstract: The measurements may be considered substantially stable for each corneal tomography and each variable, but the 2 corneal tomographies do not produce statistically equivalent measurements.

Cited by 18 publications

References 20 publications

Distribution of Anterior Chamber Angle Width and Correlation With Age, Refraction, and Anterior Chamber Depth—The Gutenberg Health Study

Distribution of Anterior Chamber Angle Width and Correlation With Age, Refraction, and Anterior Chamber Depth—The Gutenberg Health Study

Intra-session repeatability of iridocorneal angle measurements provided by a Scheimpflug photography-based system in healthy eyes

Evaluation of the Changes in Anterior Segment Morphology After Laser Peripheral Iridotomy Through One-Year Follow-Up

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