Repeatability and validity of lens densitometry measured with Scheimpflug imaging
- 1 July 2009
- journal article
- Published by Ovid Technologies (Wolters Kluwer Health) in Journal of Cataract & Refractive Surgery
- Vol. 35 (7), 1210-1215
- https://doi.org/10.1016/j.jcrs.2009.03.017
Abstract
To assess the repeatability and validity of lens densitometry derived from the Pentacam Scheimpflug imaging system. Eye Clinic, Queensland University of Technology, Brisbane, Australia. 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). 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. 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.Keywords
This publication has 33 references indexed in Scilit:
- Correlation of lens density measured using the Pentacam Scheimpflug system with the Lens Opacities Classification System III grading score and visual acuity in age-related nuclear cataractBritish Journal of Ophthalmology, 2008
- Posterior Capsule Rupture following Closed Globe Injury: Scheimpflug Imaging, Pathogenesis, and ManagementEuropean Journal of Ophthalmology, 2008
- Role of Scheimpflug Imaging in Traumatic Intralenticular Foreign BodyAmerican Journal of Ophthalmology, 2006
- Changes in the lens epithelium with respect to cataractogenesis—light microscopic and Scheimpflug densitometric analysis of the cataractous and the clear lens of diabetics and non-diabeticsAlbrecht von Graefes Archiv für Ophthalmologie, 2005
- Five-year change in visual acuity following cataract surgery in an older community: the Blue Mountains Eye StudyEye, 2004
- Universal Opacity Standard for Scheimpflug PhotographyOphthalmic Research, 2000
- The Lens Opacities Classification System IIIAmerican Journal of Ophthalmology, 1993
- The Oxford modular cataract image analysis systemEye, 1990
- Comparison between Topcon SL-45 and SL-45B with Different Correction Methods for Factors Influencing Scheimpflug ExaminationOphthalmic Research, 1990
- The Multi-Purpose Camera: A New Anterior Eye Segment Analysis SystemOphthalmic Research, 1990