Comparison of the ultrasonographic method with 2 partial coherence interferometry methods for intraocular lens power calculation

Salouti, Ramin; Nowroozzadeh, Mohammad Hossein; Zamani, Mohammad; Ghoreyshi, Maryam; Salouti, Rosa

doi:10.1016/j.optm.2010.07.025

Cited by 49 publications

(35 citation statements)

References 31 publications

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“…An exception is a recent study, 27 which reported less satisfactory average K agreement between IOLMaster and LENSTAR; the mean difference being 0.67 D, with 95% LoA given by (0.07, 1.20). The same study also reported similar 95% LoA in IOL power and AL for their LENSTAR-IOLMaster and LENSTAR-applanation comparison, which differs from the present findings.…”

Section: Discussionmentioning

confidence: 85%

Agreement analysis of LENSTAR with other techniques of biometry

Jasvinder

Khang

Sarinder

et al. 2011

Eye

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Purpose To assess the agreement of the optical low-coherence reflectometry (OLCR) device LENSTAR LS900 with partial coherence interferometry (PCI) device IOLMaster and applanation and immersion ultrasound biometry. Methods We conducted the study at the Ophthalmology Clinic, University of Malaya Medical Center, Malaysia. Phakic eyes of 76 consecutive cataract patients were measured using four different methods: IOLMaster, LENSTAR and A-scan applanation and immersion ultrasound biometry. We assessed the method agreement in the LENSTARIOLMaster, LENSTAR-applanation, and LENSTAR-immersion comparisons for axial length (AL) and intraocular lens (IOL) power using Bland-Altman plots. For average K, we compared LENSTAR with IOLMaster and the TOPCON KR-8100 autorefractor-keratometer. SRK/T formula was used to compute IOL power, with emmetropia as the target refractive outcome. Results For all the variables studied, LENSTAR agreement with IOLMaster is strongest, followed by those with immersion and applanation. For the LENSTARIOLMaster comparison, the estimated proportion of differences falling within 0.33 mm from zero AL and within 1D from zero IOL power is 100%. The estimated proportion of differences falling within 0.5 D from zero average K is almost 100% in the LENSTAR-IOLMaster comparison but 88% in the LENSTAR-TOPCON comparison. The proportion of differences falling within 0.10 mm (AL) and within 1D (IOL power) in the LENSTAR-IOLMaster comparison has practically significant discrepancy with that of LENSTAR-applanation and LENSTARimmersion comparisons.Conclusions In phakic eyes of cataract patients, measurements of AL, average K, and IOL power calculated using the SRK/T formula from LENSTAR are biometrically equivalent to those from IOLMaster, but not with those from applanation and immersion ultrasound biometry.

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Section: Discussionmentioning

confidence: 85%

Agreement analysis of LENSTAR with other techniques of biometry

Jasvinder

Khang

Sarinder

et al. 2011

Eye

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“…However, some studies found significant differences between devices. Salouti et al 5 found that Lenstar automated keratometry measurements were 0.60 to 0.65 D lower than those determined by IOLMaster automated keratometry or manual keratometry. Significantly lower mean simulated K values have also been reported for Scheimpflug imaging than for corneal topography or automated keratometry.…”

Section: Discussionmentioning

confidence: 97%

“…1,2 In addition, to achieve effective astigmatism correction, accurate keratometry (K) measurements must be obtained preoperatively. Several studies have been performed to compare corneal astigmatism measurements obtained with different keratometers, [3][4][5] Placido-disk videokeratoscopes, [6][7][8] and Scheimpflug imagers. 6,8,9 However, in general, these studies compared astigmatism magnitudes only, with no regard to the astigmatism meridian.…”

mentioning

confidence: 99%

Comparability and repeatability of corneal astigmatism measurements using different measurement technologies

Visser

Berendschot

Verbakel

et al. 2012

Journal of Cataract and Refractive Surgery

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“…Bu biyometriler, nonkontakt olmasının yanında MKK, ÖKD, lens kalınlığı, AU, keratometrik değerlerin ölçümüne de olanak sağlamaktadır. 7,[13][14][15][16] Yeni geliştirilen optik biyometri ölçümleri ile uzun yıllardır altın standart olarak kullandığımız ultra sonik biyometri ölçümleri arasındaki uyumluluk ve farklılıkların bilinmesi önemlidir. Çünkü AU hesaplanırken yapılacak 0,01 mm hata, 0,03 D GİL gücü farklılığına neden olmaktadır.…”

Section: Discussionunclassified

“…5,6 Klasik A-tarayıcı ultraso n ve optik biyometri yöntemleri, GİL gücü hesaplamasında kullanıl-maktadır. 7,8 Ultrasonik biyometride, kornea teması gerekli olduğundan, ölçümü yapan kişinin probu korneaya gereğinden çok veya az bastır-ması ile AU ölçümleri olduğundan daha kısa veya uzun ölçülebilmektedir. Ayrıca, korneal hasar ve enfeksiyon riski bulunmaktadır.…”

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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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Comparison of the ultrasonographic method with 2 partial coherence interferometry methods for intraocular lens power calculation

Cited by 49 publications

References 31 publications

Agreement analysis of LENSTAR with other techniques of biometry

Agreement analysis of LENSTAR with other techniques of biometry

Comparability and repeatability of corneal astigmatism measurements using different measurement technologies

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

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