Biometry of 3 types of intraocular lenses using Scheimpflug photography

Kim, Jae Soon; Shyn, Kyung Hwan

doi:10.1016/s0886-3350(00)00649-0

Cited by 33 publications

(21 citation statements)

References 13 publications

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“…It has been evaluated mainly in the assessment of anterior chamber depth and angle and objective densitometry of anterior segment opacities. [22][23][24][25][26][27][28] Results obtained with prototypes of the OLCR pachymeter have been published. 12,20 Genth et al 20 compared preoperative central corneal thickness measurements by US with a prototype OLCR device mounted coaxially on an excimer laser system.…”

Section: Average Values Obtained By Two Methods (µM) Pair Difference mentioning

confidence: 99%

Central corneal thickness measurement with the Pentacam Scheimpflug system, optical low-coherence reflectometry pachymeter, and ultrasound pachymetry

Barkana

Gerber

Elbaz

et al. 2005

Journal of Cataract and Refractive Surgery

278

197

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Objective, noncontact measurement of central corneal thickness with the Pentacam Scheimpflug system and OLCR pachymeter was convenient and yielded excellent intraoperator repeatability and interoperator reproducibility. Central corneal thickness values obtained with the Pentacam were similar to those obtained with both the OLCR pachymeter and an US pachymeter. Further research is needed to corroborate whether central corneal thickness measurements by the Pentacam and OLCR devices can be used interchangeably and are more clinically useful than US pachymetry.

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Section: Average Values Obtained By Two Methods (µM) Pair Difference mentioning

confidence: 99%

Central corneal thickness measurement with the Pentacam Scheimpflug system, optical low-coherence reflectometry pachymeter, and ultrasound pachymetry

Barkana

Gerber

Elbaz

et al. 2005

Journal of Cataract and Refractive Surgery

278

197

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show abstract

“…The clinical literature includes numerous reports of IOL tilt and decentration at different times after surgery or with different IOL types using commercial Scheimpflug instruments. [22][23][24][25][26][27][28] With these instruments, the optical distortion is presumably not corrected. Only a recent study of IOL tilt and decentration in eyes with phakic lenses 29 using a Nidek Scheimpflug system mentions that images were corrected using custom algorithms.…”

Section: J Cataract Refract Surg 2007; 33:418-429 Q 2007 Ascrs and Escrsmentioning

confidence: 99%

Tilt and decentration of intraocular lenses in vivo from Purkinje and Scheimpflug imaging

Castro¹,

Rosales²,

Marcos³

2007

Journal of Cataract and Refractive Surgery

177

134

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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).…”

mentioning

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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Biometry of 3 types of intraocular lenses using Scheimpflug photography

Abstract: In this study in which a properly constructed continuous curvilinear capsulorhexis was created and IOLs were accurately placed in normal capsular bags, changes in ACD, IOL decentration and tilt, and BCVA were similar in eyes with a PMMA, silicone, or soft acrylic IOL.

Cited by 33 publications

References 13 publications

Central corneal thickness measurement with the Pentacam Scheimpflug system, optical low-coherence reflectometry pachymeter, and ultrasound pachymetry

Central corneal thickness measurement with the Pentacam Scheimpflug system, optical low-coherence reflectometry pachymeter, and ultrasound pachymetry

Tilt and decentration of intraocular lenses in vivo from Purkinje and Scheimpflug imaging

Intraocular lens alignment from Purkinje and Scheimpflug imaging

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