Repeatability and reproducibility of a new optical biometer in normal and keratoconic eyes

Yağcı, Ramazan; Güler, Emre; Kulak, Ali Ender; Erdoğan, Beyza Doğanay; Balcı, Mehmet; Hepşen, İbrahim F.

doi:10.1016/j.jcrs.2014.04.039

Cited by 28 publications

(28 citation statements)

References 18 publications

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“…Yagci et al showed high repeatability of CCT values by the AL-Scan in both normal and keratoconic groups. Although its reproducibility was not better than other available Scheimpflug systems, the AL-Scan showed excellent and comparable repeatability and reproducibility in most ocular parameters' measurements [ 10 – 12 , 24 , 25 ]. Thus, it was useful to review and compare the currently used devices such as Pentacam (Oculus, Wetzlar, Germany), Galilei (Ziemer, Port, Switzerland), and Sirius (Costruzione Strumenti Oftalmici, Florence, Italy) as they all use the principle of the Scheimpflug imaging to measure the CCT despite the lack of direct comparison between the AL-Scan and other Scheimpflug systems.…”

Section: Discussionmentioning

confidence: 97%

Comparison between a New Optical Biometry Device and an Anterior Segment Optical Coherence Tomographer for Measuring Central Corneal Thickness and Anterior Chamber Depth

Huang

Lü

Savini

et al. 2016

Journal of Ophthalmology

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Purpose. To compare between a new optical biometer (AL-Scan, Nidek Co., Aichi, Japan) and an anterior segment optical coherence tomographer (Visante AS-OCT, Carl Zeiss Meditec, Dublin, USA) for measuring central corneal thickness (CCT), anterior chamber depth (ACD), and aqueous depth (AD). Methods. Sixty-three eyes of 63 normal subjects were examined with AL-Scan and Visante AS-OCT in this prospective study. One eye per subject was measured three times with both devices to record their CCT, ACD, and AD. All procedures were performed by the same operator. Agreement between the two devices was assessed using paired t-tests, Bland-Altman plots, and 95% limits of agreement (LoA). Results. The mean CCT, ACD, and AD measured by AL-Scan were 538.59 ± 27.37 μm, 3.70 ± 0.30 mm, and 3.16 ± 0.30 mm, respectively. The mean values obtained by the Visante OCT were 536.14 ± 26.61 μm for CCT, 3.71 ± 0.29 mm for ACD, and 3.17 ± 0.29 mm for AD. The mean CCT by the AL-Scan was higher than that obtained by the Visante AS-OCT (difference = 2.45 ± 6.07 μm, P < 0.05). The differences in ACD and AD measurements were not statistically significant. The 95% LoA of CCT, ACD, and AD were between −9.44 and 14.35 μm, −0.15 and 0.12 mm, and −0.15 and 0.12 mm, respectively. Conclusions. Since these two devices were comparable for measuring CCT, ACD, and AD, their results can be interchangeably used in the clinic.

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Section: Discussionmentioning

confidence: 97%

Comparison between a New Optical Biometry Device and an Anterior Segment Optical Coherence Tomographer for Measuring Central Corneal Thickness and Anterior Chamber Depth

Huang

Lü

Savini

et al. 2016

Journal of Ophthalmology

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“…The precision of AL measurement is currently a hot topic. The PCI biometer was reported to have high repeatability for AL measurement in children [27][28][29][30]. Kimura et al [28] found that the repeatability for AL measurement in myopic children was ± 0.05 mm with the PCI biometer.…”

Section: Discussionmentioning

confidence: 99%

Effect of orthokeratology on precision and agreement assessment of a new swept-source optical coherence tomography biometer

et al. 2020

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Background: To evaluate the effect of orthokeratology on precision of measurements in children using a new swept-source optical coherence tomography (SS-OCT) optical biometer (OA-2000), and agreement between its measurements and those provided by the commonly used IOLMaster based on partial coherence interferometry (PCI). Methods: This study recruited fifty-one eyes of 51 normal children (8-16 years). An operator took measurements with the two biometers. Then, a second operator took measurements with the SS-OCT biometer. After orthokeratology was performed for one month, the same operators repeated the same procedures. Axial length (AL), mean keratometry (Km) at 2.5 mm and 3.0 mm diameters (Km 2.5 and Km 3.0), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT) and corneal diameter (CD) were analyzed. Results: With the SS-OCT optical biometer, the test-retest repeatability of AL measurements was < 0.06 mm. For all parameters, the coefficients of variation were < 1.23% and the intraclass correlation coefficients were > 0.95. The 95% limits of agreement of difference between the two devices for CD parameter were up to 1.53 mm. After orthokeratology, the fluctuation ranges of difference for Km3.0 measurement was 1.11 times higher than before orthokeratology, while the absolute values of difference for AL, Km2.5, ACD and CD measurements were comparable. Conclusions: Before and after orthokeratology, the SS-OCT biometer showed high repeatability and reproducibility for all measurements. Wearing orthokeratology contact lenses affected the agreement between SS-OCT and PCI biometers for Km3.0 measurements. The CD measurement showed poor agreement between the two devices.

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“…ise keratokonus hastalarında AL-Scan ölçümlerinin güvenilir ve tekrarlanabilir olduğunu bildirmiş-lerdir. 20 AL-Scan ve IOL Master optik biyometri cihazları ile elde edilen ölçümlerin karşılaştırıldığı başka bir çalışmada, diğer çalışmalardan farklı olarak absolü hata ve hedef refraksiyondan sapma değerleri de değerlendirilmiş ve AL-Scan ile elde edilen ortalama sferik eşdeğer hatanın 0,03±0,51 olarak ölçüldüğü ve hastaların %64'ünün ±0,50 D aralığında, %96'sının ±1,00 D aralığında saptandığı bildirilmiştir. IOL Master ile elde edilen biyometrik ölçümler ve sferik eş-değer hata arasında fark olmadığı ve daha objektif veriler için ileri çalışmalara ihtiyaç olduğu ŞEKİL 5: Refraktif sapma ile ön kamara derinliği arasındaki ilişki.…”

Section: Discussionunclassified

The Reliability of Biometric Measurements Obtained by AL-Scan Optic Biometer in Intraocular Lens Power Calculation

Doğan¹,

Polat²,

Yavaş³

et al. 2015

Turkiye Klinikleri J Ophthalmol

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Ö ÖZ ZE ET T A Am ma aç ç: : AL-Scan optik biyometri cihazı ile elde edilen biyometrik ölçümlerin güvenirliliği-nin değerlendirilmesi ve beklenen refraksiyondan sapma değerlerinin yaş, aksiyel uzunluk (AU), keratometri değerleri (K1, K2) ve ön kamara derinliği (ÖKD) ile ilişkisinin incelenmesidir. G Ge er re eç ç v ve e Y Yö ön nt te em ml le er r: : Ocak 2013-Nisan 2013 tarihleri arasında Afyon Kocatepe Üniversitesi Tıp Fakültesi Göz Hastalıkları Anabilim Dalı'nda katarakt tanısı ile ameliyat edilmiş hastaların dosyaları geriye dönük incelendi. Optik biyometri ölçümünde AL-Scan cihazı kullanılmış ve aynı cerrah tarafın-dan sorunsuz katarakt ameliyatı uygulanmış 34 hastanın 34 gözü çalışmaya dâhil edildi. Hastaların göz ve sistemik bulguları, elde edilen AU, K1, K2 keratometri, ÖKD, emetropi için önerilen göz içi lens gücü ölçümleri ile birinci ay refraksiyon kusurundan sapma değerleri kaydedildi. p<0,05 istatistiksel olarak anlamlı kabul edildi. B Bu ul lg gu ul la ar r: : Hastaların yaş ortalaması 64,73±12,4 yıl (42-81) idi. Cihazdan elde edilen ortalama AU 23,45±0,87 mm, ortalama K1 keratometri 44,02±1,23 diyoptri, ortalama K2 değeri 43,92±1,22 diyoptri ve ortalama ÖKD 3,32±0,4 mm olarak saptandı. Elde edilen hedef refraksiyondan sapma sferik eşdeğeri birinci ayda -0,75-+1,12 diyoptri arasında değişmekte idi ve ortalama -0,06±0,43 diyoptri olarak hesaplandı. Regresyon analizinde hedef refraksiyondan sapma değerleri ile yaş, AU, K1 keratometri, K2 keratometri ve ÖKD parametreleri arasında ilişki gösterilemedi (p>0,05). S So on nu uç ç: : Son yıllarda klinik kullanıma giren AL-Scan optik biyometri cihazı ile elde edilen optik biyometri ölçümleri güvenilir olup, modern katarakt cerrahisinde hedeflenen emetropinin sağlanmasında kullanılabilir.A An na ah h t ta ar r K Ke e l li i m me e l le er r: : Biyometri; lensler, göz içi; refraksiyon, oküler A AB BS S T TR RA AC CT T O Ob bj je ec ct ti iv ve e: : To evaluate the reliability of AL-Scan optical biometer in biometrical measurements and investigate the relationship between refractive deviation and age, axial length (AL), keratometrical values (K1,K2) and anterior chamber depth (ACD). M Ma at te er ri ia al l a an nd d M Me et th ho od ds s: : The records of patients who had cataract surgery between January 2013 and April 2013 in Afyon Kocatepe University, Department of Ophthalmology were evaluated retrospectively. 34 eyes of 34 patients records who underwent uncomplicated phacoemulsification surgery and intracapsular intraocular lens implantation were enrolled to the study. Biometrical measurements of all patients were taken with AL-Scan device. Ophthalmological and systemical examination's findings, AL, K1 K2 keratometrical values, ACD and the deviation between target spherical equivalent (SE) and postoperative 1st month SE were recorded and evaluated. A p value less than 0.05 was accepted as statistically significant. R Re es su ul lt ts s: : The mean age was 64.73±12.4 (42-81) years. The mean AL was 23.45±0.87 mm, mean K1 keratometry value was 44.02±1.23 dio...

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Repeatability and reproducibility of a new optical biometer in normal and keratoconic eyes

Abstract: No author has a financial or proprietary interest in any material or method mentioned.

Cited by 28 publications

References 18 publications

Comparison between a New Optical Biometry Device and an Anterior Segment Optical Coherence Tomographer for Measuring Central Corneal Thickness and Anterior Chamber Depth

Comparison between a New Optical Biometry Device and an Anterior Segment Optical Coherence Tomographer for Measuring Central Corneal Thickness and Anterior Chamber Depth

Effect of orthokeratology on precision and agreement assessment of a new swept-source optical coherence tomography biometer

The Reliability of Biometric Measurements Obtained by AL-Scan Optic Biometer in Intraocular Lens Power Calculation

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