Quantitative assessment of macular thickness in normal subjects and patients with diabetic retinopathy by scanning retinal thickness analyser

Abstract

AIMS To evaluate the scanning retinal thickness analyser (RTA), a novel non-invasive imaging instrument, in diagnosing and quantitatively characterising diabetic macular oedema, and to investigate the relation between central macula thickness measured by RTA and other clinical examinations. METHODS Central macular thickness was measured using the RTA in 40 normal subjects and 60 patients with diabetic retinopathy. The reproducibility of the retinal thickness measurements was evaluated by calculating the mean of the inter- and intrasession variations. Central macular thickness was correlated with the results of visual acuity measurements, biomicroscopy, and fluorescein angiography. RESULTS Intra- and intersession reproducibility of the RTA in normal subjects was plus or minus 5.2% (16 μm) and plus or minus 6.1% (19 μm), respectively. The mean central macular thickness was 182 (SD 16) μm in normal subjects, 283 (116) μm in diabetic eyes without clinically significant macular oedema (CSMO), and 564 (168) μm in diabetic eyes with CSMO. Central macular thickness was significantly greater (pr² = 0.76) in diabetic eyes. CONCLUSION Scanning RTA, which has good reproducibility, might be useful to quantitatively detect and monitor macular thickening in diabetic retinopathy. Central macular thickness was highly correlated with logarithmic converted visual acuity in diabetic macular oedema.