Retinal Thickness in Diabetic Retinopathy A Comparison between Optical Coherence Tomography, the Retinal Thickness Analyser and Fundus Photography
Goebel W., Franke R.
Dept. of Ophthalmology, University of Wuerzburg
Purpose: To compare retinal thickness in diabetic patients measured by Optical Coherence Tomography (OCT) and the new Retinal Thickness Analyser (RTA).
Method: The macula of 20 eyes from 10 patients with diabetes mellitus was examined with OCT and RTA. Mesurements of retinal thickness were compared with signs of macular edema in stereo fundus photography. For each eye, 9 different sectors were analysed (foveal sector, 4 parafoveal sectors, 4 extrafoveal sectors).
Results: 10 of the 20 eyes showed signs of macular edema in fundus photography. Mean retinal thickness of the foveal sector was 210±76µm in RTA and 276±111µm in OCT measurements. There was a good overall correlation between OCT and RTA (r=0.72). The correlation was best in the foveal (r=0.88) and the parafoveal sectors (r=0.78).
Conclusions: Both measuring techniques yield similar results when examining eyes of patients with diabetes although absolute values differ. The RTA seems to be more prone to erroneous or missing thickness readings under difficult measuring conditions (cataract, floaters, retinal hemorrhages and exsudates).
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