Influence of operator experience on the performance of ultrasound biometry compared to optical biometry before cataract surgery

Findl, Oliver; Kriechbaum, Katharina; Sacu, Stefan; Kiss, Barbara; Polak, Kaija; Nepp, Johannes; Schild, Gebtraud; Rainer, Georg; Maca, Saskia; Petternel, Vanessa; Lackner, Birgit; Drexler, Wolfgang

doi:10.1016/s0886-3350(03)00243-8

Cited by 120 publications

(92 citation statements)

References 11 publications

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“…It is necessary to evaluate the clinical impact of the difference between preoperative and postoperative AL measurements found in the present study. A measurement error in AL of 0.10 mm corresponds to approximately 0.28 diopters (D) [9,11]. In our study, this equivalence results in a refractive error of about 0.53 D. As the intraocular lens power goes in 0.50 D steps for the SN60WF model, and 1.00 D steps for the MA60MA model, we consider the difference found in this study is not clinically significant.…”

Section: Discussionmentioning

confidence: 48%

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Change in Axial Length Pre and Post Cataract Surgery Measured with IOL Master

López¹,

López²,

Juan³

et al. 2016

J Clin Exp Ophthalmol

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Objective: Cataract surgery with intraocular lens (IOL) implantation tries to get a refractive result nearby to the optic emmetropia. So an accurate IOL power calculation is mandatory, and axial length (AL) measurement is one of the most influential parameter in this calculation. IOL Master is one of the most popular devices to measure AL, which uses the same group refractive index of the lens for all patients, independently of the cataract grade. But lens refractive index is higher as cataract grade increases. Nowadays cataract tends to be operated earlier, so moderate cataracts are the most extracted in clinical practice. Therefore, it is important to study the influence of moderate lens opacity in AL measurements. The objective of this study was to compare the AL value measures with IOL Master, before and after uncomplicated cataract surgery in patients with moderate cataracts. Material and methods:This study included 153 eyes of 105 patients (67.51 ± 13.56 years old) undergoing uncomplicated cataract surgery. Lens opacity was determined with the LOCSIII scale and AL was measured using optical biometry (IOL Master; Carl Zeiss Meditec) before and one month after intervention. Intraoperative measurements (ultrasound time and fluid volume) were also registered.Results: Mean preoperative AL of 25.10 ± 3.19 mm (range 20.54 to 36.06; IC95% 24.59 to 25.60 mm) and postoperative of 24.88 ± 3.16 mm (IC 95% 24.37 to 25.39; range 20.43 to 35.79 mm). The mean AL difference before and after surgery was 0.19 ± 0.05 mm (p=0.549 ANOVA) with agreement limits from 0.09 to 0.29 mm. It was observed more difference in eyes with larger AL (r 2 =0.14 p<0.01). The average cataract grade in each category was: nuclear opacity 2.25 ± 1.00 (range 1 to 5) (p=0.564 ANCOVA), cortical opacity 2.04 ± 0.73 (range 0 to 4) (p=0.543 ANCOVA), posterior subcapsular opacity 0.44 ± 0.90 (range 0 to 4) (p=0.563 ANCOVA), and nuclear color 2.40 ± 1.05 (range 0 to 5) (p=0.558 ANCOVA), without statistical significant effect in the AL difference pre and after cataract surgery. The ultrasound time used during the surgery was 43 ± 29 seconds (p=0.525 ANCOVA) and the fluid volume was 4.73 ± 1.31 (p=0.560 ANCOVA) cubic centimeters without statistically significant relationship between these parameters and the difference in the AL measurement. Conclusions:The difference in AL measurement with IOL Master before and after cataract surgery in eyes with low grade of cataract should be related with IOL Master reproducibility especially in extreme-long eyes. Moderate cataract showed non-statistically effect on AL measurement with IOL Master biometry.

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Section: Discussionmentioning

confidence: 48%

“…Optic biometry, based on the partial coherence interferometry (PCI), is one of the most performed techniques in the last years to AL measurement prior to cataract surgery [7] with accurate results [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Change in Axial Length Pre and Post Cataract Surgery Measured with IOL Master

López¹,

López²,

Juan³

et al. 2016

J Clin Exp Ophthalmol

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“…Como fator favorável às mensurações da biometria ocular, ressalta-se o fato das mesmas terem sido obtidas pelo mesmo aparelho, além de serem realizadas por um examinador único e com rotina de exame, em consonância ao referido por Findl et al (2003).…”

Section: Discussionunclassified

Relação entre a biometria ultrassonográfica ocular e os parâmetros morfométricos do crânio, idade, peso e gênero em gatos domésticos

Ferreira¹,

Allemann

Dias

et al. 2014

Pesq. Vet. Bras.

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Pesq. Vet. Bras. 34(2):192-198, fevereiro 2014 192 RESUMO.-O exame ultrassonográfico ocular é indispensá-vel no pré-operatório de procedimentos cirúrgicos intraoculares como a facectomia, além de ser uma ferramenta complementar ao exame oftalmológico, em casos de perda da transparência dos meios ópticos. A inexistência de estudos acerca de padrões de normalidades para as medidas do bulbo ocular e de suas estruturas internas nos gatos, cujos valores possibilitam o monitoramento de enfermidades e auxiliam em procedimentos cirúrgicos motivaram este estudo. Utilizaram-se 40 gatos, adultos, machos e fêmeas, livres de enfermidades sistêmica e oftalmológica. Destes, 22 eram da raça persa (grupo braquicefálico -GB) e 18 sem raça definida (grupo não braquicefálico -GNB). A biometria ultrassonográfica ocular transcorneana foi realizada, em modo-B∕A, com o transdutor microlinear de 9 MHz e as medidas D1 (profundidade da câmara anterior), D2 (diâ-metro do cristalino), D3 (profundidade da câmara vítrea) e D4 (diâmetro axial do bulbo ocular) aferidas. Ainda, menRelação entre a biometria ultrassonográfica ocular e os parâmetros morfométricos do crânio, idade, peso e gênero em gatos domésticos Ocular ultrasonography is a helpful ophthalmic examination, performed on the absence of transparency in ocular means and frequently requested prior intraocular surgery. Unfortunately, the lack of studies upon ultrasonografic images of the normal feline eye, difficults the evaluation of its biometry and its inner structures in many ophthalmic diseases and also before surgery. The objective of this study was to evaluate the ocular biometry and the morphometric parameters of the cranium of 40 healthy adult cats, including 22 Persian cats (Brachycephalic group -BG) and 18 Mixed-breed cats (Noun brachycephalic group -NBG). B/A-mode ultrasonographic biometry, utilizing a 9 MHz probe, was performed for depth of the anterior chamber (D1), lens axial length (D2), depth of the vitreous chamber (D3) and axial length of the globe (D4). Morphometric parameters of the cranium were obtained for bizygomatic (BZ) and occipital frontal (OF) diameters. Data was collected and statistical analysis, including "t" paired tests, variance and covariance analysis and multiple linear regressions was performed for every obtained measure and also for animal ages, weigh and gender. Statistic relevant values were observed in D4 parameter for female cats of BG. Multiple linear regression indicated some influence of the weigh, age and OF in D1, D2 and D4 of PG; and of BZ in D1, D3 and D4 of NBG. Besides that, it was observed that biometry was also influenced by weigh, age and morphometric parameters of their craniums in both groups.

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“…[13][14][15][16] This method has been reported to have a high degree of intraoperator and interoperator reproducibility. [4] Placement of the probe on the corneal center can lead to operator-dependent errors due to offcenter placement (thicker measurements) , [17,18] indentation (thinner readings) [19] are the drawbacks of pachymeter. Disadvantages like patient discomfort, epithelial damage and risk of infection also exist.…”

Section: Discussionmentioning

confidence: 99%