Results 111 to 120 of about 2,132 (158)

Speckle interferometry by partial coherent beam

SPIE Proceedings, 2003
By using new theoretical point of view on cross-spectral density function of the field, the propagation of partially coherent beam produce by a plane source is investigated. Then we show, experimentally, the coherence length in the source plane can be measured directly from the far zone intensity distribution.
H. Tajalli, M. Sahrai, D. Jafari
openaire   +1 more source

Dispersion Effects in Partial Coherence Interferometry: Implications for Intraocular Ranging

Journal of Biomedical Optics, 1999
In nondispersive media, the minimum distance that can be resolved by partial coherence interferometry (PCI) and optical coherence tomography (OCT) is inversely proportional to the source spectral bandwidth. Dispersion tends to increase the signal width and to degrade the resolution.
Christoph Hitzenberger, Adolf Friedrich Fercher, Angela Baumgartner   +2 more
exaly   +3 more sources

Intraocular Lens Power Measured by Partial Coherence Interferometry

Optometry and Vision Science, 2012
ABSTRACT Purpose To compare the accuracy of the intraocular lens (IOL) power calculation of the Zeiss IOLMaster versus conventional automated keratometry and contact acoustic biometry after personalized optimization. Methods
Yi-Ting, Hsieh, I-Jong, Wang
openaire   +2 more sources

Immersion A-scan compared with partial coherence interferometry

Journal of Cataract and Refractive Surgery, 2002
To compare 2 methods of axial length measurement, immersion ultrasonography and partial coherence interferometry, and to elucidate surgical outcomes based on immersion measurements.Oregon Eye Institute, Eugene, Oregon, USA.Axial length measurements in 50 cataractous eyes were obtained by optical biometry (IOLMaster, Zeiss Humphrey Systems) and ...
Mark, Packer, I Howard, Fine, Richard S, Hoffman, Peggy G, Coffman, Laurie K, Brown   +4 more
openaire   +2 more sources

Repeat-Pass SAR Interferometry With Partially Coherent Targets

IEEE Transactions on Geoscience and Remote Sensing, 2012
By means of the permanent scatterer (PS) technique, repeated spaceborne synthetic aperture radar (SAR) images with relatively low resolution (about 25 m × 5 m for the European Remote Sensing (ERS) and Envisat satellites) can be used to estimate the displacement (1-mm precision) and 3-D location (1-m precision) of targets that show an unchanged ...
Daniele Perissin, Teng Wang 0001
openaire   +1 more source

Partial coherence interferometry: a novel approach to biometry in cataract surgery

American Journal of Ophthalmology, 1998
To compare biometry performed by an enhanced version of dual beam partial coherence interferometry and applanation ultrasound in a prospective study of 85 cataract eyes to improve refractive outcome of cataract surgery due to a more accurate calculation of intraocular lens power.The SRK II formula using ultrasound biometry data was employed.
Oliver Findl, Christoph Hitzenberger, Clemens Vass   +2 more
exaly   +3 more sources

Off‐axis partial coherence interferometry in myopes and emmetropes

Ophthalmic and Physiological Optics, 2012
Abstract Purpose This study describes the axial and peripheral dimensions of myopic and emmetropic eyes in a wide range of retinal locations using a non‐contact optical biometer (Zeiss IOLM aster) based upon the principle of ...
Asieh, Ehsaei, Catharine M, Chisholm, Ian E, Pacey, Edward A H, Mallen   +3 more
openaire   +2 more sources

Eye-length measurement by interferometry with partially coherent light

Optics Letters, 1988
With a multimode semiconductor laser we have been able to measure the optical length of the eye within a precision of 0.03 mm. A first series of in vivo measurements acoustically determined eye length.
A F, Fercher, K, Mengedoht, W, Werner
openaire   +2 more sources

Accuracy and reproducibility of biometry using partial coherence interferometry

Journal of Cataract and Refractive Surgery, 2002
To determine whether partial coherence interferometry is comparable to standard contact ultrasonic biometry in accuracy, reproducibility, and ease of use.Academic university practice.In this prospective study, simultaneous biometry was performed in 91 consecutive patients (111 eyes) using partial coherence interferometry (IOLMaster, Zeiss Humphrey ...
Rafe, Connors, Peter, Boseman, Randall J, Olson   +2 more
openaire   +2 more sources

Biometry combining Scheimpflug imaging and partial coherence interferometry versus standard partial coherence interferometry biometry

Journal Français d'Ophtalmologie
To compare measurements of mean keratometry (K), axial length (AL), Jackson first and second astigmatism vector (J0 and J45), astigmatism magnitude, white-to-white (WTW) diameter and anterior chamber depth (ACD) values between two biometers, the Pentacam® AXL and the IOL Master 500.Public hospital in Belgium.Retrospective instrument reliability ...
V.E.W.C.M. van Renterghem, F.-X. Crahay
openaire   +2 more sources