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Anterior segment imaging and corneal topography

Anterior segment imaging and corneal topography
Anterior segment imaging and corneal topography

Anterior segment imaging is a rapidly advancing field of ophthalmology. New imaging modalities, such as rotating Scheimpflug imaging (Pentacam-Scheimpflug) and anterior segment optical coherence tomography (Visante OCT and Slit-Lamp OCT), have become commercially available. These new modalities supplement the more established imaging devices of Orbscan scanning slit topography and ultrasound biomicroscopy (UBM). All devices provide software that allows quantitative information, as well as, qualitative imaging of the cornea and anterior chamber. They provide quantitative angle estimation by calculating the angle between the iris surface and the posterior corneal surface. Direct angle visualization is also possible with the OCT devices and UBM; they provide images of the scleral spur, ciliary body, ciliary sulcus and even canal of Schlemm in some eyes. Pentacam- Scheimpflug can measure net corneal power, a feature particularly useful for cataract patients having undergone previous corneal surgery. Anterior segment OCT can also measure corneal dimensions and anterior chamber width prior to phakic intraocular lens implantation. Latest findings show it to be useful in the presence of corneal opacities. The arrival of the new imaging devices may herald the dawn of a new era for ophthalmic diagnosis, particularly in view of the ease and non-contact nature of many of the examination modalities.

Angel measurements, Anterior chamber, Anterior segment oct, Computerised tomography, Cornea, Corneal topography, Fourier domain, Keratoconus, Keratometry, Keratoplasty, Magnetic resonance imaging, Optical coherence tomography, Pachymetry, Placido ring topography, Purkinje-sanson images, Scanning slit tomography, Scheimpflug imaging, Time domain, Ultrasound biomicroscopy
13-30
Bentham Science Publishers
Konstantopoulos, Aristides
c54185a9-1ef3-4b6d-91a3-38de444cc4fb
Hossain, Parwez
563de5fc-84ad-4539-9228-bde0237eaf51
Azuara-Blanco, Augusto
Hossain, Parwez
Lois, Noemi
Konstantopoulos, Aristides
c54185a9-1ef3-4b6d-91a3-38de444cc4fb
Hossain, Parwez
563de5fc-84ad-4539-9228-bde0237eaf51
Azuara-Blanco, Augusto
Hossain, Parwez
Lois, Noemi

Konstantopoulos, Aristides and Hossain, Parwez (2012) Anterior segment imaging and corneal topography. In, Azuara-Blanco, Augusto, Hossain, Parwez and Lois, Noemi (eds.) Diagnostic Technologies in Ophthalmology. Bentham Science Publishers, pp. 13-30. (doi:10.2174/978160805133511201010013).

Record type: Book Section

Abstract

Anterior segment imaging is a rapidly advancing field of ophthalmology. New imaging modalities, such as rotating Scheimpflug imaging (Pentacam-Scheimpflug) and anterior segment optical coherence tomography (Visante OCT and Slit-Lamp OCT), have become commercially available. These new modalities supplement the more established imaging devices of Orbscan scanning slit topography and ultrasound biomicroscopy (UBM). All devices provide software that allows quantitative information, as well as, qualitative imaging of the cornea and anterior chamber. They provide quantitative angle estimation by calculating the angle between the iris surface and the posterior corneal surface. Direct angle visualization is also possible with the OCT devices and UBM; they provide images of the scleral spur, ciliary body, ciliary sulcus and even canal of Schlemm in some eyes. Pentacam- Scheimpflug can measure net corneal power, a feature particularly useful for cataract patients having undergone previous corneal surgery. Anterior segment OCT can also measure corneal dimensions and anterior chamber width prior to phakic intraocular lens implantation. Latest findings show it to be useful in the presence of corneal opacities. The arrival of the new imaging devices may herald the dawn of a new era for ophthalmic diagnosis, particularly in view of the ease and non-contact nature of many of the examination modalities.

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More information

Published date: 1 December 2012
Keywords: Angel measurements, Anterior chamber, Anterior segment oct, Computerised tomography, Cornea, Corneal topography, Fourier domain, Keratoconus, Keratometry, Keratoplasty, Magnetic resonance imaging, Optical coherence tomography, Pachymetry, Placido ring topography, Purkinje-sanson images, Scanning slit tomography, Scheimpflug imaging, Time domain, Ultrasound biomicroscopy

Identifiers

Local EPrints ID: 444926
URI: http://eprints.soton.ac.uk/id/eprint/444926
PURE UUID: 22f668a7-1f26-4094-8b54-4e9bca59a79c
ORCID for Parwez Hossain: ORCID iD orcid.org/0000-0002-3131-2395

Catalogue record

Date deposited: 12 Nov 2020 17:30
Last modified: 06 Jun 2024 01:43

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Contributors

Author: Aristides Konstantopoulos
Author: Parwez Hossain ORCID iD
Editor: Augusto Azuara-Blanco
Editor: Parwez Hossain
Editor: Noemi Lois

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