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A.A. Pineiro, M.J. Blanco, P. Pacheco, C. Capeans, M. Sanchez–Salorio; Assessment of Posterior Vitreo–Retinal Interface by Means of Ultrasonography and Optical Coherence Tomography. A Comparative Analysis . Invest. Ophthalmol. Vis. Sci. 2005;46(13):1578.
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Purpose: Many diseases of the vitreous and retina affect the vitreo–retinal interface. The aim of this work was to compare ultrasonography (US) and optic coherence tomography (OCT) in the evaluation of posterior hyaloid status (detachment and/or traction). Methods: Seven patients with posterior vitreo–retinal disorders were studied by means of biomicroscopy, US and OCT. For US examination we have utilized the I3–System ABD (Innovative Imaging Inc. Sacramento, California). This system provides a probe of 10 MHz with sector scan angle of 53º for A– and B–modes posterior segment ocular ultrasonography. The ultrasonographic study was carried out with a 90 dB gain and in kinetic and quantitative mode. For OCT study we utilized the Stratus III System (Humphrey, Carl Zeiss) in mode Macular Thickness. In all cases the ocular media were sufficient clear to image the retina by means of OCT. Collected data were studied to compare the findings related to the posterior hyaloid status. Results:Seven eyes of seven patients were included in this study (3 men, 4 women). The biomicroscopic diagnoses were: 1 epiretinal membrane, 1 macular traction syndrome, 1 diabetic and diffuse macular edema and 4 macular holes. By US in all cases was detected a macular thickening with or without complete posterior vitreous detachment. By OCT the biomicroscopic diagnoses of retinal affectation were confirmed. In cases of macular hole, OCT refined the stage in relation to the biomicroscopic findings. Nevertheless, the status of posterior hyaloid was not correlated between US and OCT, overall when vitreous body was collapsed. Conclusions: On the OCT image the posterior hyaloid membrane is indistinguishable from the superficial retina, but becomes apparent when the posterior vitreous is detached and, very important, without collapse. In ocular pathology that affects to posterior vitreo–retinal interface and to elucidate the status of posterior hyaloid, kinetic B–scan and OCT analysis must be carried out.
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