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Biometry of cataractous eyes using partial coherence interferometry: clinical feasibility study of a commercial prototype I.

Abstract：

PURPOSE:To evaluate the clinical feasibility of the prototype version of a commercial partial coherence interferometry instrument (axial length measurement, ALM, Carl Zeiss Jena) for noninvasive, high-precision biometry in cataractous eyes. SETTING:Department of Ophthalmology, Vienna General Hospital, and Institute of Medical Physics, University of Vienna, Austria. METHODS:The preoperative axial length in 49 eyes of 37 cataract patients was measured with the commercial (ALM) and laboratory (PCI) prototypes of the partial coherence interferometry instrument, as well as with immersion ultrasound (IUS). RESULTS:Axial length measurements with the ALM and PCI did not differ significantly (P = .23). Both prototypes assessed longer axial lengths than the IUS technique (P < .0001; median 203 microm; range -476 to +635 microm). The precision of the axial length measurement was 18 microm, 28 microm, and 54 microm with the PCI, ALM, and IUS, respectively. CONCLUSIONS:Partial coherence tomography is a high-precision, high-resolution, noncontact biometric technique.The commercial PCI prototype is practical in clinical use, with improved comfort for patients, no need for anesthesia, and a reduced risk of infection. However, the difference between the PCI and IUS in axial length measurement must be considered when using the constants supplied by intraocular lens (IOL) manufacturers for IOL power calculations.

journal_name

J Cataract Refract Surg

journal_title

Journal of cataract and refractive surgery

authors

Kiss B,Findl O,Menapace R,Wirtitsch M,Drexler W,Hitzenberger CK,Fercher AF

doi

10.1016/s0886-3350(01)01272-x

subject

Has Abstract

pub_date

2002-02-01 00:00:00

pages

224-9

issue

2

eissn

0886-3350

issn

1873-4502

pii

S088633500101272X

journal_volume

28

pub_type

临床试验,杂志文章

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