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N Ebisawa, T Saito, T Deguchi, M Takasu, S Yoneya, T Gil, I Katzir; Oxygen Level in the Fovea After Retinal Detachment Surgery . Invest. Ophthalmol. Vis. Sci. 2002;43(13):625.
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Purpose:To evaluate the correlation between post-operative visual acuity and fundus oxygen saturation (OS) level in the macula of the patients with rhegmatogeneous retinal detachment. Methods:Thirty six eyes of 36 patients ranging in age from 9 to 66 year old with rhegmatogenous retinal detachment involving the macula were treated with procedures of cryoretinopexy, drainage and encircling. Visual acuity, optical coherent tomography (OCT), and oxymetry using a spectral retinal imager (ASI Ltd, Migdal Ha'Emak, Israel) were performed before and 1 week, 1month, 3 months after surgery. OS distribution was measured with a newly developed Fourier transform fundus oxymeter. These cases were classified into 3 groups according to the foveal findings with OCT; group 1: no foveal detachment left after buckling surgery. group 2: foveal detachment disappeared within 3 months. group 3: prolonged foveal detachment more than 3 months. The spectral retinal imager which we used for this study consists of a fundus camera (Topcon TRC-50IA), a Sagnac interferometer with a charge-coupled device (CCD), and acquisition and analysis software modules that are running on a personal computer. The image acquisition process takes 6 seconds in which the fundus is illuminated by the white incandescent light of the fundus camera at the regular power settings. OS values in each pixel of the fundus image with a 35- degree view can then be estimated from the respective spectrum that is obtained by Fourier-transforming the interferometer signals. All patients were followed up to 1 year after the surgery, and relationship between visual acuity and OS levels in the fovea was evaluated among those three groups Results:Seventeen eyes in group 1 showed well recovery of visual acuity accompanied with OS levels. In seventeen eyes of group 2, visual acuity and OS levels in fovea were improved after the disappearance of foveal detachment. Visual acuity and OS value were remained at low level in group 3. Conclusion:Visual recovery after the surgery was well correlated with OS level and if the presence of foveal detachment.
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