Evaluation of the Repeatability and the Reproducibility of AL-Scan Measurements Obtained by Residents

Kola, Mehmet; Duran, Hikmet; Türk, Adem; Mollamehmetoğlu, Süleyman; Kalkişim, Ahmet; Erdöl, Hidayet

doi:10.1155/2014/739652

Cited by 10 publications

(11 citation statements)

References 17 publications

(32 reference statements)

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“…Moreover, the ICC values were higher than those in the study by Kola et al . and the TRT values were less than that in our previous study 9 , 15 . The study by Chen et al 25 , Huang et al 26 , and Savini et al 27 discovered that the ICC for the rotating Scheimpflug imaging was similar to the current study.…”

Section: Discussioncontrasting

confidence: 87%

“…Repeatability and reproducibility of CD and PD were high in children, thereby confirming the results previously reported with the same biometer by Kola et al . in adult patients 9 . The study revealed that the agreement for CD was not satisfactory, since the 95% LoA was between −1.10 and 0.26 mm.…”

Section: Discussionmentioning

confidence: 98%

“…Both ultrasonic and optical methods can obtain ocular biometric parameters. Although ultrasonography is the conventional measuring method, it might cause discomfort in patients, corneal epithelial defect, or infection 5 – 9 . Unlike ultrasound biometry, optical biometry devices have the advantage of not requiring any contact with the eye.…”

Section: Introductionmentioning

confidence: 99%

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Precision of a new ocular biometer in children and comparison with IOLMaster

Chen

Savini

et al. 2018

Sci Rep

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To assess the repeatability and reproducibility of AL-Scan in agreement with those by the IOLMaster in healthy children, two skilled operators measured ocular parameters in 58 children. The parameters included keratometry (K) values, anterior chamber depth (ACD), axial length (AL), central corneal thickness (CCT), pupil diameter (PD), and corneal diameter (CD). The cohort comprised of 32 boys and 26 girls. The AL-Scan measurements showed high repeatability, as the test-retest repeatability (TRT) values of AL, CCT, ACD, Kf, Ks, Km, CD, and PD were 0.09 mm, 5.1 μm, 0.04 mm, 0.28 D, 0.24 D, 0.21 D, 0.39 mm, and 0.22 mm, respectively. The within-subject coefficient of variation (CoV) was low (<0.35%) and the intraclass correlation coefficients (ICC) of all parameters were >0.85. The interobserver reproducibility was excellent with low values of TRT and ICC > 0.95. The CoV of AL, CCT, ACD, and K was <0.22%. The 95% limits of agreement between the AL-Scan and the IOLMaster were narrow for all parameters except for CD. The repeatability and reproducibility of the new biometer, Al-Scan, was excellent for all parameters and can be routinely used in children to measure the biometric values.

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Section: Discussioncontrasting

confidence: 87%

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Precision of a new ocular biometer in children and comparison with IOLMaster

Chen

Savini

et al. 2018

Sci Rep

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“…The AL Scan is an optical biometer that measures the distance between the anterior surface of the cornea and the retinal pigment epithelium with a superior accuracy compared to the A-scan ultrasound. Since the AL Scan is based on the principle of partial coherence interferometry, the results were not affected by silicone oil, and there was good agreement between the AL Scan and IOLMaster in measuring the AL [3][4][5]. Thus, we justify the use of Pentacam for measuring corneal astigmatism and ACD and AL Scan for measuring AL.…”

Section: Discussionmentioning

confidence: 79%

Refractive Outcomes following Vitrectomy and Phacovitrectomy in Rhegmatogenous Retinal Detachment

Liu

Che

et al. 2020

Preprint

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Background Cataracts are commonly seen during the diagnosis of rhegmatogenous retinal detachment (RRD) or occur following its surgical management. Refractive changes following combined phacoemulsification and vitrectomy (phacovitrectomy) can affect the quality of vision. This study aimed to evaluate the refractive changes following vitrectomy versus phacovitrectomy in patients with RRD. Methods A total of 96 patients who underwent retinal surgery for RRD in one eye, between August 2016 and January 2018, were enrolled and divided into three groups. In 18 eyes, 23-gauge transconjunctival sutureless vitrectomy (23G TSV) was performed (group A); 25G TSV was performed in 49 eyes (group B), and phacovitrectomy with 25G TSV was performed in 29 eyes (group C). Silicone oil was injected after the surgery in all three groups. Anterior and posterior corneal astigmatism, axial length (AL), and anterior chamber depth (ACD) were measured at baseline and postoperatively at 1 week, 1 month, and 3 months. Results Anterior and posterior corneal astigmatism did not change, and AL continued to increase for 3 months after surgery, whereas ACD decreased postoperatively but quickly returned to baseline in groups A and B. In group C, anterior and posterior corneal astigmatism, AL, and ACD increased postoperatively, and corneal astigmatism returned to baseline by 3 months, but AL and ACD continued to increase for 3 months. Conclusion Vitrectomy alone does not affect anterior or posterior corneal astigmatism. Following vitrectomy, the AL increases, while the ACD decreases transiently. When vitrectomy is combined with phacoemulsification for cataract removal, the anterior and posterior corneal astigmatism increases transiently, while AL and ACD are enlarged for several months following surgery.

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“…18 Kola ve ark., yapmış oldukları başka bir çalışmada, ölçümü yapan kişilerden bağımsız olarak AL-Scan ile alınan tüm biyometrik ölçüm-lerin tekrarlanabilirliği ve güvenirliliğinin yük-sek olduğunu bildirmişlerdir. 19 Yağcı ve ark. ise keratokonus hastalarında AL-Scan ölçümlerinin güvenilir ve tekrarlanabilir olduğunu bildirmiş-lerdir.…”

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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Evaluation of the Repeatability and the Reproducibility of AL-Scan Measurements Obtained by Residents

Cited by 10 publications

References 17 publications

Precision of a new ocular biometer in children and comparison with IOLMaster

Precision of a new ocular biometer in children and comparison with IOLMaster

Refractive Outcomes following Vitrectomy and Phacovitrectomy in Rhegmatogenous Retinal Detachment

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

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