The role of the optical coherence tomography in identifying shape and size of idiopathic epiretinal membranes
- Correspondence to Professor Dr Michael Georgopoulos, Department of Ophthalmology, Medical University of Vienna, Spitalgasse 23, Vienna A-1090, Austria;
Contributors All authors have participated directly in planning and execution of the work and have approved the final version of the manuscript. BH: acquisition of data, drafting and writing the article; MG: conception and design, acquisition of data, final approval; RS: analysis and interpretation of data, drafting the article; WG: acquisition of data, statistical analysis; and US-E: conception and design, revising the article critically for important intellectual content.
- Accepted 28 December 2011
- Published Online First 10 February 2012
AIM Currently, the border of idiopathic epiretinal membranes (iERM) is outlined intraoperatively using vital dyes. Therefore, the authors set out to investigate the role of the preoperative retinal thickness map (RTM) of the optical coherence tomography (OCT) in identifying the shape and the size of the iERMs.
Methods 15 eyes of 15 patients with iERM who underwent vitrectomy with indocyanine green-assisted membrane peeling were included in this study. The authors analysed the intraoperative fundus images and preoperative Cirrus HD-OCT to detect the shape and the size of the iERM as well as the shape and the size of each thickness-indicating colour (white, red, orange and yellow) on the RTM, respectively. The correlation of areas and morphologic characteristics between both groups was explored.
Results Analysis of iERM morphologic characteristics (shape) showed a similarity between the iERM contour and the corresponding RTM in 13 cases (86.6%). Furthermore, retinal folds were found in six iERMs and in their corresponding RTMs. Analysis of iERM size (area) revealed a positive correlation between the iERM area and each studied coloured area in RTM. The most significant correlation was between iERM and the red area (440–480 μm; r=0.87, p<0.0001).
Conclusion The iERM-related retinal folds are clearly distinguishable on the HD-OCT. The red area in RTM representing the 440–480 μm retinal thickness can be a reliable predictor of the extent and the shape of the iERM.
- Optical coherence tomography
- epiretinal membrane
- indocyanine green
- retinal thickness map
- treatment surgery
- treatment lasers
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.
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