Measuring the cornea: the latest developments in corneal topography.

Abstract:

PURPOSE OF REVIEW:Corneal measurement uses Placido-disc topographers and tomographers, creating three-dimensional corneal models from cross-sectional images. Technology includes slit scanning, Scheimpflug imaging, very high frequency ultrasound, and high-speed anterior segment optical coherence tomography. RECENT FINDINGS:Normative data in the Asian population using the Orbscan, and repeatability information for the 3 and 5-mm zone were reported. Best fit sphere and the thinnest point were not significantly different, but posterior surface elevation was higher using the Orbscan in keratoconic eyes. Pachymetry data from the Pentacam show pattern differences used as keratoconus indices. Scheimpflug imaging identified changes in the posterior surface that were not mirrored by the anterior surface with aging, and may be better for surgical planning than conventional keratometry following excimer treatments. Optical coherence tomography mean central corneal thickness measurements were repeatable; however, mean central epithelial thickness measurements were not. Very high frequency ultrasound can be used successfully to create epithelial and flap thickness maps. Studies reveal specular microscopy measures thinner and less reliable readings than Pentacam and Orbscan. SUMMARY:New corneal topographers, such as Scheimpflug imaging, ultrasound and optical coherence tomography have expanded capabilities and precision in measuring the structure of the cornea.

journal_name

Curr Opin Ophthalmol

authors

Swartz T,Marten L,Wang M

doi

10.1097/ICU.0b013e3281ca7121

subject

Has Abstract

pub_date

2007-07-01 00:00:00

pages

325-33

issue

4

eissn

1040-8738

issn

1531-7021

pii

00055735-200707000-00010

journal_volume

18

pub_type

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