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Repeatability and validity of lens densitometry measured with Scheimpflug imaging

Kirkwood, Bradley J, Hendicott, Peter Leslie, Read, Scott A., & Pesudovs, Konrad (2009) Repeatability and validity of lens densitometry measured with Scheimpflug imaging. Journal of Cataract & Refractive Surgery, 35(7), pp. 1210-1215.

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Abstract

Purpose To assess the repeatability and validity of lens densitometry derived from the Pentacam Scheimpflug imaging system.

Setting Eye Clinic, Queensland University of Technology, Brisbane, Australia.

Methods This prospective cross-sectional study evaluated 1 eye of subjects with or without cataract. Scheimpflug measurements and slitlamp and retroillumination photographs were taken through a dilated pupil. Lenses were graded with the Lens Opacities Classification System III. Intraobserver and interobserver reliability of 3 observers performing 3 repeated Scheimpflug lens densitometry measurements each was assessed. Three lens densitometry metrics were evaluated: linear, for which a line was drawn through the visual axis and a mean lens densitometry value given; peak, which is the point at which lens densitometry is greatest on the densitogram; 3-dimensional (3D), in which a fixed, circular 3.0 mm area of the lens is selected and a mean lens densitometry value given. Bland and Altman analysis of repeatability for multiple measures was applied; results were reported as the repeatability coefficient and relative repeatability (RR).

Results Twenty eyes were evaluated. Repeatability was high. Overall, interobserver repeatability was marginally lower than intraobserver repeatability. The peak was the least reliable metric (RR 37.31%) and 3D, the most reliable (RR 5.88%). Intraobserver and interobserver lens densitometry values in the cataract group were slightly less repeatable than in the noncataract group.

Conclusion The intraobserver and interobserver repeatability of Scheimpflug lens densitometry was high in eyes with cataract and eyes without cataract, which supports the use of automated lens density scoring using the Scheimpflug system evaluated in the study

Impact and interest:

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ID Code: 29571
Item Type: Journal Article
DOI: 10.1016/j.jcrs.2009.03.017
ISSN: 0886-3350
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2009 Elsevier.
Deposited On: 14 Jan 2010 09:08
Last Modified: 22 Feb 2013 11:55

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