Comparison of the Zeiss IOLMaster and applanation A‐scan ultrasound: biometry for intraocular lens calculation

Rose, Loreto; Moshegov, Con N

doi:10.1046/j.1442-9071.2003.00617.x

Cited by 127 publications

(68 citation statements)

References 17 publications

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“…In a comparative study of 50 cataractous eyes, pre and postoperatively, Packer et al 23 found that 92% of them were within 0.50 D and 100% were within 1 D of the targeted refraction; IOL power was computed from the IOLMaster using the Holladay II formula. Two other studies 7,24 showed that a high percentage of patients (87 and 91%) assigned to IOLMaster biometry achieved targeted refraction of within 1 D, compared with about 80% in the applanation group. In another study, 25 the two figures were even reported to be as high as 96 and 93%, respectively.…”

Section: Discussionmentioning

confidence: 98%

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: 98%

Agreement analysis of LENSTAR with other techniques of biometry

Jasvinder

Khang

Sarinder

et al. 2011

Eye

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“…Axial length can easily and precisely be measured. [16][17][18] Several studies have shown a decrease of axial eye length with lowered intraocular pressure after trabeculectomy. [19][20][21][22] A recent study by Leydolt et al 23 measured the change of axial eye length after mechanically inducing intraocular pressure elevation.…”

Section: à3mentioning

confidence: 99%

“…Moreover, resolution and precision of partial coherence interferometry is known to be about 10 times better than that of ultrasound-based methods. 16,24 Recent studies using finite element modelling showed that the biomechanical properties of the corneoscleral shell profoundly affect the level of mechanical stress experienced by the optic nerve head (ONH). 27,28 Forces at the ONH have been shown to be up to 180 times IOP.…”

Section: Eyementioning

confidence: 99%

Non-invasive biometric assessment of ocular rigidity in glaucoma patients and controls

Ebneter

Wagels

Zinkernagel

2008

Eye

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Purpose To determine in vivo whether a pharmacologically induced change in intraocular pressure (IOP) leads to measurable changes in axial eye length and whether there is a difference between glaucoma patients and control subjects. Methods 42 subjects (19 patients with primary open angle glaucoma and 23 control patients matched for age and gender) underwent axial eye length measurement using partial coherence laser interferometry and measurement of IOP using dynamic contour tonometry before and 2 h after oral intake of 500 mg acetazolamide. Student's t-test was used to compare differences in the means. Results An identical drop in IOP was induced in both the glaucoma (mean ± SEM: 2.90 ± 0.44 mmHg, n ¼ 19) and the control group (mean±SEM: 3.17±0.32 mmHg, n ¼ 23). The change in axial eye length was significantly smaller (P ¼ 0.026) in the glaucoma group (mean±SEM: À14.2±3.2 lm, n ¼ 19) compared with the control group (mean ± SEM: À23.0 ± 2.98 lm, n ¼ 23). Conclusions Our results strongly suggest that the ocular rigidity is increased in patients with established glaucoma in comparison to control subjects. Ocular rigidity could play a role in the pathogenesis and pathophysiology of glaucoma. Determination of ocular rigidity could be helpful in detection of glaucoma.

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“…Partial coherence interferometry, by the IOL Master (Zeiss, Jena, Germany), has recently become available and is essentially technician independent [2]. In addition, the IOL Master provides a noncontact technique with no risk of infection or corneal abrasion [3]. The AL measured by the IOL Master (AL IOLM ) is more accurate and reproducible than that by US (AL US ) in a normal eye [4, 5] or in a pseudophakic eye [6].…”

Section: Introductionmentioning

confidence: 99%

Impact of Nuclear Cataract Density on Postoperative Refractive Outcome: IOL Master versus Ultrasound

et al. 2007

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Purpose: To evaluate the effect of cataract density on the postoperative refractive outcome. Methods: For 59 nuclear cataract eyes, the axial length was preoperatively measured by the IOL Master (Zeiss, Germany) and ultrasound (US; UD-6000, Tomey, Japan) and the cataract density by EAS-1000 (Nidek, Japan). The prediction error was used as evaluation of the accuracy of ocular biometry. Results: There were significant differences between IOL Master and US in the mean error (0.24 ± 0.63 vs. 0.69 ± 0.64 dpt, p < 0.001) and the mean absolute error (0.57 ± 0.36 vs. 0.79 ± 0.53 dpt, p < 0.001). The cataract density was significantly correlated with the prediction error with IOL Master (r = 0.24, p = 0.03) and US (r = 0.29, p = 0.01). Conclusions: Measurements with the IOL Master are slightly affected by the cataract density due to the refractive index change, but its accuracy is less affected than US.

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Comparison of the Zeiss IOLMaster and applanation A‐scan ultrasound: biometry for intraocular lens calculation

Abstract: The IOLMaster provides an accurate axial length measurement and results in accurate intraocular lens power calculation based on the SRK/T formula. It is quick and easy to use and provides a non-contact technique with no risk of infection or corneal abrasion.

Cited by 127 publications

References 17 publications

Agreement analysis of LENSTAR with other techniques of biometry

Agreement analysis of LENSTAR with other techniques of biometry

Non-invasive biometric assessment of ocular rigidity in glaucoma patients and controls

Impact of Nuclear Cataract Density on Postoperative Refractive Outcome: IOL Master versus Ultrasound

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