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Intrasession repeatability of optical coherence tomography measures in active neovascular age‐related macular degeneration
Author(s) -
Patel Praveen J.,
Chen Fred K.,
Ikeji Felicia,
Richardson Matthew,
Cruz Lyndon Da,
Tufail Adnan
Publication year - 2011
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2009.01761.x
Subject(s) - repeatability , optical coherence tomography , macular degeneration , optometry , medicine , ophthalmology , coherence (philosophical gambling strategy) , computer science , medical physics , artificial intelligence , mathematics , statistics
. Objectives: To determine the repeatability of Stratus optical coherence tomography fast macular thickness map analysis in patients with active neovascular age‐related macular degeneration (nAMD). Methods: Consecutive pairs of scans from 112 eyes of 112 consecutive patients with active nAMD were analyzed. The Bland–Altman coefficient of repeatability (CR) was calculated for each retinal thickness or volume measure. Results: The CR for the central 1 mm macular subfield was 59 μm (18% of retinal thickness) and did not exceed 69 μm in any subfield. There was much poorer repeatability for the center‐point thickness (CPT) measure (CR of 78 μm; 24%). However, in the subgroup of 38 patients with no S tratus software low analysis confidence message on either analysis map, the revised CR (42 μm) for the CPT measure and the A1 subfield (40 μm) were similar. Conclusion: Optical coherence tomography‐derived retinal thickness measurements are subject to measurement variability in patients with active nAMD. The results suggest a change criterion of more than 59 μm in central 1 mm (A1) subfield macular thickness is necessary to distinguish true clinical change from measurement variability in these patients.