Novel grid combined with peripheral distortion correction for ultra-widefield image grading of age-related macular degeneration
Received 5 June 2017
Accepted for publication 9 August 2017
Published 8 November 2017 Volume 2017:11 Pages 1967—1974
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Dr Scott Fraser
Patrick Oellers,1,* Inês Laíns,1,2,* Steven Mach,1 Shady Garas,1 Ivana K Kim,1 Demetrios G Vavvas,1 Joan W Miller,1 Deeba Husain,1 John B Miller1
1Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA; 2Faculty of Medicine, University of Coimbra, Coimbra, Portugal
*These authors contributed equally to this work
Purpose: Eyes with age-related macular degeneration (AMD) often harbor pathological changes in the retinal periphery and perimacular region. These extramacular changes have not been well classified, but may be phenotypically and functionally relevant. The purpose of this study was to demonstrate a novel grid to systematically study peripheral retinal abnormalities in AMD using geometric distortion-corrected ultra-widefield (UWF) imaging.
Methods: This is a cross-sectional observational case series. Consecutive patients with AMD without any other coexisting vitreoretinal disease and control patients over age 50 without AMD or any other vitreoretinal disease were imaged using Optos 200 Tx. Captured 200° UWF images were corrected for peripheral geometric distortion using Optos transformation software. A newly developed grid to study perimacular and peripheral abnormalities in AMD was then projected onto the images.
Results: Peripheral and perimacular changes such as drusen, retinal pigment epithelium changes and atrophy were found in patients with AMD. The presented grid in conjunction with geometric distortion-corrected UWF images allowed for systematic study of these peripheral changes in AMD.
Conclusion: We present a novel grid to study peripheral and posterior pole changes in AMD. The grid is unique in that it adds a perimacular zone, which may be important in characterizing certain phenotypes in AMD. Our UWF images were corrected for geometric peripheral distortion to accurately reflect the anatomical dimensions of the retina. This grid offers a reliable and reproducible foundation for the exploration of peripheral retinal pathology associated with AMD.
Keywords: ultra-widefield, autofluorescence, macular degeneration, grid, periphery, drusen, retinal pigment epithelium changes
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