Measurement of postoperative intraocular lens tilting and decentration using Scheimpflug images

Sasaki, Kohsuke; Sakamoto, Y.; Shibata, Takashi; Nakaizumi, Hiroko; Emori, Yasufumi

doi:10.1016/s0886-3350(89)80071-9

Cited by 63 publications

(29 citation statements)

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“…9 Measurements of the IOL tilt and decentration measured with Scheimpflug imaging have been reported in the clinical literature, although in these instruments optical distortion is presumably not corrected. [10][11][12][13][14][15][16] Custom correcting algorithms have been used in a report of IOL tilt and decentration of phakic lenses and measured with a refurbished Nidek Scheimpflug system, which is no longer commercially available. 17 Here, we review the development (hardware and software), validation and measurements of two instruments based on Purkinje and Scheimpflug imaging, developed at the Visual Optics and Biophotonics Laboratory (Instituto de Óptica, Consejo Superior de Investigaciones Científicas).…”

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confidence: 99%

Intraocular lens alignment from Purkinje and Scheimpflug imaging

Rosales

Castro

Jiménez-Alfaro

et al. 2010

Clinical and Experimental Optometry

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The improved designs of intraocular lenses (IOLs) implanted during cataract surgery demand understanding of the possible effects of lens misalignment on optical performance. In this review, we describe the implementation, set-up and validation of two methods to measure in vivo tilt and decentration of IOLs, one based on Purkinje imaging and the other on Scheimpflug imaging. The Purkinje system images the reflections of an oblique collimated light source on the anterior cornea and anterior and posterior IOL surfaces and relies on the well supported assumption of the linearity of the Purkinje images with respect to IOL tilt and decentration. Scheimpflug imaging requires geometrical distortion correction and image processing techniques to retrieve the pupillary axis, IOL axis and pupil centre from the three-dimensional anterior segment image of the eye. Validation of the techniques using a physical eye model indicates that IOL tilt is estimated within an accuracy of 0.261 degree and decentration within 0.161 mm. Measurements on patients implanted with aspheric IOLs indicate that IOL tilt and decentration tend to be mirror symmetric between left and right eyes. The average tilt was 1.54 degrees and the average decentration was 0.21 mm. Simulated aberration patterns using custom models of the patients eyes, built using anatomical data of the anterior cornea and foveal position, the IOL geometry and the measured IOL tilt and decentration predict the experimental wave aberrations measured using laser ray tracing aberrometry on the same eyes. This reveals a relatively minor contribution of IOL tilt and decentration on the higher-order aberrations of the normal pseudophakic eye.

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confidence: 99%

Intraocular lens alignment from Purkinje and Scheimpflug imaging

Rosales

Castro

Jiménez-Alfaro

et al. 2010

Clinical and Experimental Optometry

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“…7); (2) area densitometry of the slit image of a crystalline lens; (3) measurement of the anterior chamber depth and thickness of the whole lens and lens layers obtained from the slit image; (4) measurement of the chamber angle noticed in the slit image [4]; (5) measurement of the positioning of an implanted intraocular lens from two images taken with different slit angles [5], and (6) measurement of opaque areas in the pupillary zone documented in the retroillumination image ( fig. 8).…”

Section: Methodsmentioning

confidence: 99%

The Multi-Purpose Camera: A New Anterior Eye Segment Analysis System

et al. 1990

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A new device for the analysis of the anterior eye segment was developed. With this device, a Scheimpflug slit image and a retroiUumination image can be taken separately using a CCD camera. The quality of the images obtained was satisfactory enough for analysis. The data obtained were stored and analyzed on an almost real-time level using an on-line computer. The menu for the data analysis provided for this device includes multilinear densitometry, with planimetry, area densitometry, measurement of anterior chamber depth and thickness of lens layers, determination of chamber angle and positioning of implanted intraocular lenses, and measurement of opaque areas in the retroiUumination image.

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“…Shibata et al [28] evaluated biometric characteristics of pseudophakic eyes, Sasaki et al [36,37] succeeded in demonstrating intraocular lens tilting three-dimensionally.…”

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confidence: 99%

Scheimpflug Photography in Clinical Ohthalmology

Müller-Breitenkamp¹,

Hockwin²

1992

Ophthalmic Res

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The development of a slitlamp camera system based on the Scheimpflug principle with image analysis has been a major improvement in lens and cataract research. Since its introduction into ophthalmology by Brown and Niesel in the sixties of this century and further technical amelioration by Hockwin, Dragomirescu and Sasaki it has been applied in various experimental and clinical investigations. The purpose of this paper is to summarize and review the application of Scheimpflug photography in clinical ophthalmology and to show possibilities and indications for the use of the Scheimpflug technique in clinical studies.

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Measurement of postoperative intraocular lens tilting and decentration using Scheimpflug images

Cited by 63 publications

References 3 publications

Intraocular lens alignment from Purkinje and Scheimpflug imaging

Intraocular lens alignment from Purkinje and Scheimpflug imaging

The Multi-Purpose Camera: A New Anterior Eye Segment Analysis System

Scheimpflug Photography in Clinical Ohthalmology

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