Evaluation of the Lenstar LS 900 non-contact biometer

Cruysberg, Lars P J; Doors, Muriël; Verbakel, Frenne; Berendschot, Tos T. J. M.; Brabander, John de; Nuijts, Rudy M.M.A.

doi:10.1136/bjo.2009.161729

Cited by 162 publications

(141 citation statements)

References 15 publications

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“…Therefore, lens thickness may be greater in HD patients than in healthy patients. Pre-HD lens thickness was approximately 4.52 mm in our patients, which is comparable to that measured by Shammas and Hoffer 15 and thicker than that measured by Cruysberg et al 14 It should be noted that patients in the latter study were, on average, 25.9 years younger than our patients. This is relevant because our data showed that lens thickness was highly correlated with subject age.…”

Section: Discussionsupporting

confidence: 86%

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Effect of hemodialysis on intraocular lens power calculation

et al. 2015

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Background To evaluate changes in ocular biometric parameters after hemodialysis (HD) in patients with end-stage renal disease (ESRD). Methods Forty eyes of 40 patients undergoing HD were included in this cross-sectional study. Keratometry (K) readings, white-to-white (WTW) distance, central corneal thickness (CCT), anterior chamber depth (ACD), pupil diameter, lens thickness (LT), axial length (AL), and intraocular lens (IOL) power calculation were measured with Lenstar LS 900 (Haag Streit AG, Koeniz, Switzerland) before and after hemodialysis. Intraocular pressure (IOP) was measured with a non-contact tonometer (Tonopachy NT-530P, Nidek Co., LTD, Tokyo, Japan). Main outcomes were changes in biometric parameters after HD. Reliability of the measurements (intraclass correlation coefficients (ICCs)) and the effect size (Cohen's d) were also calculated. Results Mean difference in AL before and after HD was À0.041 ± 0.022 mm with ICCs40.90 (p50.001 and Cohen's d ¼ 0.06). Pupil diameter was also significantly different before Hemodialysis had no significant effect on K readings, WTW distance, CCT, ACD, LT, or IOP. Conclusion Axial length and pupil diameter increase after HD with small effect size, while HD does not significantly affect IOL power calculations.

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Section: Discussionsupporting

confidence: 86%

“…Cruysberg et al 14 . Similarly, we found a 0.041 mm difference of the axial length after HD and IOL power difference of approximately 0.05 D. Although, the difference in AL is statistically significant, it has a small effect size (Cohen's d ¼ 0.06) which decreases the clinical significance of the axial length differences.…”

Section: Discussionmentioning

confidence: 99%

Effect of hemodialysis on intraocular lens power calculation

et al. 2015

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“…In the current study, all variables and the corneal power were normally distributed in the population, which differs from the results of previous studies [15]. The mean AL in the Chinese study was longer than in the current and some previous studies and appears to be closely associated with genetic and environmental Factors [16].…”

Section: Discussioncontrasting

confidence: 99%

Lenstar LS 900 Analysis of 2000 Cataract Patients: A Cross-Sectional Study

Gohari¹,

mahdavian²,

Shojaei³

et al. 2017

J Clin Exp Ophthalmol

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Purpose: To analyze biometry data and corneal astigmatism in cataract candidates from Yazd. Methods:The corneal thickness, anterior chamber depth and keratometry measurements of anteroposterior width were measured using the IOL Master system. Ocular biometric data were collected and analyzed in the year 2015.Results: The study comprised of 2000 patients' cataract candidates with a mean age of 66.79 ± 10.72 years (range 28 to 100 years). No significant differences were found between these variables for mean ± SDs of age and gender (p<0.05). The correlation coefficients analysis between four evaluated variables and age showed there is a significant correlation between anterior chamber depth and age; however, there was no association between age and other factors. Also, the results showed a significant correlation between the radius of cornal curvature, anterior chamber depth, corneal thickness and anterior-posterior length. Conclusions:This study provides reference data for cataract patients from Yazd. The profiles of ocular biometric data can help improve surgical procedures and intraocular lens design for the Yazd population.

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“…2 In the case of the Lenstar (Haag-Streit, Koeniz, Switzerland), the interclass coefficient of the variation of the astigmatism axis was 0.915 and the mean arithmetic difference between the two measurement sessions was 3.19°, with an absolute difference of a median of 9°. 5 The Lenstar keratometry has repeatable values, 6,7 but according to Zhao et al, 7 the Lenstar and the IOLMaster cannot be used interchangeably in relation to keratometric data. With regard to average keratometric data, it seems that the Lenstar is biometrically equivalent to the IOLMaster, 8 and the correlation between the cylinder axis measurements of the IOLMaster and the Lenstar is high.…”

Section: O R I G I N a L A R T I C L Ementioning

confidence: 99%

Repeatability Data and Agreement of Keratometry With the VERION System Compared to the IOLMaster

Németh¹,

Szalai²,

Hassan³

et al. 2015

J Refract Surg

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he exact measurement of the radius of the curvature of the cornea is crucial for planning the diopter of the intraocular lenses (IOLs) for implantation during cataract surgery. The error in measurements of the keratometric data can lead to unwanted postoperative refractive error. Although keratometric mistakes are not the first or most frequent source of error in today's biometric methods, 1 keratometry has an undisputed and important role in cataract surgery. Moreover, cases of implantation of toric IOLs require more precise keratometric readings and cylinder axis determination than ever before.There are numerous papers showing that the repeatability of keratometric measurements is excellent in the case of the IOLMaster (Carl Zeiss Meditec, Jena, Germany), 2-4 although above 42.0 diopters (D), the cylinder axis has relatively low repeatability data.2 In the case of the Lenstar (Haag-Streit, Koeniz, Switzerland), the interclass coefficient of the variation of the astigmatism axis was 0.915 and the mean arithmetic difference between the two measurement sessions was 3.19°, with an absolute difference of a median of 9°. 5 The Lenstar keratometry has repeatable values, 6,7 but according to Zhao et al., 7 the Lenstar and the IOLMaster cannot be used interchangeably in relation to keratometric data. With regard to average keratometric data, it seems that the Lenstar is biometrically equivalent to the IOLMaster, 8 and the correlation between the cylinder axis measurements of the IOLMaster and the Lenstar is high.9 However, Rohrer et al. 9 observed that the differences between the axis value of the flattest meridian in the Lenstar and the IOLMaster in a large percentage of patients is unacceptably high. Besides these controversialTo analyze the repeatability of keratometric and white-to-white (WTW) distance measurements with the VERION Measurement Module (Alcon Laboratories, Inc., Fort Worth, TX) and to compare the measured data to the results of the IOLMaster (Carl Zeiss Meditec, Jena, Germany). METHODS:Three images were captured with the VERION and the flattest and steepest keratometric data, the astigmatism axis, and the WTW distance were recorded. Subsequently, the axial length, the keratometric data with axis, and the WTW distance were measured with an IOLMaster. The repeatability data of the keratometric value of the VERION System, converted to cross cylinder J 0 and J 45 vector components, were analyzed. The agreement data for keratometry obtained by the VERION System and the differences regarding keratometric data and WTW distance compared to IOLMaster were calculated. RESULTS:The measurements were conducted in 50 eyes of 50 healthy volunteers (median age: 50.32 years, range: 19.34 to 85.3 years). The flattest and the steepest keratometric data, the diopter of astigmatism, the J 0 and J 45 vector components, and WTW distance did not differ significantly between devices (P > .05). Intraclass correlation coefficients (range: 0.863 to 0.994) and Cronbach's alpha values (range: 0.950 to 0.998) were high for all p...

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Evaluation of the Lenstar LS 900 non-contact biometer

Cited by 162 publications

References 15 publications

Effect of hemodialysis on intraocular lens power calculation

Effect of hemodialysis on intraocular lens power calculation

Lenstar LS 900 Analysis of 2000 Cataract Patients: A Cross-Sectional Study

Repeatability Data and Agreement of Keratometry With the VERION System Compared to the IOLMaster

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