Comparison of anterior segment measurements by 3 Scheimpflug tomographers and 1 Placido corneal topographer

Savini, Giacomo; Carbonelli, Michele; Sbreglia, Alessandra; Barboni, Piero; Deluigi, Giulia; Hoffer, Kenneth J.

doi:10.1016/j.jcrs.2011.03.055

Cited by 88 publications

(64 citation statements)

References 29 publications

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“…This "two in one system" allows a fast and complete analysis of both the entire cornea and the anterior segment in one step. A pachymetry map is then reconstructed using the point-bypoint anterior and posterior corneal surface data [12][13][14][15][16][17][18].…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, several optical devices have been developed to measure CCT such as Orbscan II (Bausch & Lomb, Rochester, NY, USA), Pentacam HR (Oculus Inc, Wetzlar, Germany), Sirius (CSO, Firenze, Italy), Galilei (Ziemer, Port, Switzerland) and Optical Coherence Tomography [7][8][9][10][11][12][13][14][15][16]. USP is a contact method, which requires corneal anesthesia and can cause corneal discomfort and infections.…”

Section: Introductionmentioning

confidence: 99%

“…They do not cause corneal discomfort and there is no risk of infections; furthermore, they are less operator-dependent. For those above reasons, the no-contact devices are becoming increasingly common in the clinical practice [6][7][8][9][10][11][12][13][14][15][16][17][18]. Several authors have started to investigate the reproducibility of corneal pachymetry of those different optical devices.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors have started to investigate the reproducibility of corneal pachymetry of those different optical devices. The results comparing different devices have provided contrasting results [6][7][8][9][10][11][12][13][14][15][16][17][18]. This prospective study was undertaken to compare CCT measurements obtained with Orbscan II, Pentacam HR and Sirius in healthy eyes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Central corneal thickness evaluation in healthy eyes with three different optical devices

Lanza

Paolillo

Carnevale

et al. 2015

Contact Lens and Anterior Eye

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Central corneal thickness evaluation in healthy eyes with three different optical devices

Lanza

Paolillo

Carnevale

et al. 2015

Contact Lens and Anterior Eye

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“…Esta técnica es implementada en la lámpara de hendidura. Por otra parte, entre los sistemas comerciales que son utilizados para realizar mediciones sobre la superficie de la córnea se encuentran [7]: Pentacam, Sirius, TMS-5, Keratron y Orbscan II. Tales sistemas realizan mediciones muy precisas sobre la superficie de la córnea.…”

Section: Introductionunclassified

Three-dimensional scanning of the cornea by using a structured light module

Barrios¹,

Morón²,

Contreras³

et al. 2017

Opt. Pura Apl.

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ABSTRACT:Corneal topography is a computerized diagnostic tool that creates a three-dimensional map of the surface of the cornea. Corneal topography provides tools needed to know the morphology, optics, power distribution and radii of the anterior surface of the cornea. This is of great help for multiple fields of optometry and ophthalmology: contact lens fitting, keratoconus detection and tracking and corneal ecstasies, detection of suspicious corneas in refractive surgery, etc. Although there are basically two types of corneal surveyors: specular reflection and elevation, many authors agree that the accuracy of these devices is affected by multiple factors, which obey both the mathematical process used and certain physiological variables. Three-dimensional (3D) scanning systems, consisting of devices based on a structured light module, are widely used to perform high-precision measurements in primarily industrial and medical applications. The present work is proposed to show the application of fringe projection technique in three-dimensional scanning of corneal surface.Key words: Three-dimensional scanning, corneal surface, optometry RESUMEN:La topografía corneal es una herramienta diagnóstica computarizada que crea un mapa tridimensional de la superficie de la córnea. La topografía corneal proporciona herramientas necesarias para conocer la morfología, la óptica, la distribución de la potencia y de los radios, de la superficie anterior de la córnea. Esto es de gran ayuda para múltiples campos de la optometría y la oftalmología: adaptación de lentes de contacto, detección y seguimiento de queratocono y ectasias corneales, detección de córneas sospechosas en cirugía refractiva, etc. Aunque existen básicamente dos tipos de topógrafos corneales: de reflexión especular y de elevación, muchos autores coinciden que la precisión de estos dispositivos es afectada por múltiples factores, que obedecen tanto al proceso matemático empleado como a ciertas variables fisiológicas. Los sistemas de digitalización tridimensional (3D), formados por dispositivos que se basan en un módulo de luz estructurada, son usados ampliamente para realizar mediciones de alta precisión en aplicaciones industriales y médicas principalmente. El presente trabajo se plantea con el objetivo de mostrar la aplicación de la técnica de proyección de franjas en la digitalización tridimensional de la superficie de la córnea.Palabras clave: Digitalización tridimensional, superficie de la córnea, optometría

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Influence of Anterior Chamber Depth, Lens Thickness, and Corneal Diameter on Intraocular Lens Power Calculation

Ferreira,

Campos

2024

Intraocular Lens Calculations

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The main IOL power formulas are described along with the input variables used by each of them to predict the IOL position and the refractive outcomes reported by published studies. An overview of measurements techniques of anterior chamber depth, lens thickness, and corneal diameter is given. The impact of these variables is illustrated for the Barrett Universal II, EVO, Haigis, Hill-RBF, Hoffer Q, Holladay 1, Holladay 2, Kane, Olsen, PEARL-DGS, and SRK/T formulas. With formulas that do not take the anterior chamber into account, eyes with a deeper anterior chamber are more likely to experience a hyperopic outcome compared to eyes with a shallow anterior chamber. With most formulas, a tendency toward a myopic shift occurs with thin lenses and toward a hyperopic shift with thick lenses. Corneal diameter has a minimal effect on IOL power calculation.

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Comparison of anterior segment measurements by 3 Scheimpflug tomographers and 1 Placido corneal topographer

Abstract: Although the measurements of some parameters by different instruments were similar, caution is warranted before using them interchangeably.

Cited by 88 publications

References 29 publications

Central corneal thickness evaluation in healthy eyes with three different optical devices

Central corneal thickness evaluation in healthy eyes with three different optical devices

Three-dimensional scanning of the cornea by using a structured light module

Influence of Anterior Chamber Depth, Lens Thickness, and Corneal Diameter on Intraocular Lens Power Calculation

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