Objective To observe the pathological changes of branch retinal artery occlusion (BRAO) by optical coherence tomography (OCT). Methods Twenty-six eyes of 26 patients with BRAO diagnosed in our Center from December 2002 to June 2005 were examined by OCT. The intervals of disease onsets and OCT examinations in all patients were within 2 weeks. The OCT scan modes were horizontal or vertical lines, and the locations of OCT scanning were macular area and the posterior pole of retina. The retinal thicknesses of macular foveola were measured and the macular thicknesses in different obstructive locations were compared using ANOVA analysis. The correlations of visual acuity and retinal thickness were analyzed by Pearson correlation analysis. Results Among the 26 eyes with BRAO, 9 eyes with temporosuperior artery occlusion, 8 eyes with temporoinferior artery occlusion, 7 eyes with arteriole occlusion and 2 eyes with retinal ciliary artery occlusion were observed. The pathological characteristics of OCT images of BRAO were increased retinal thickness and reflectivity in the obstructive locations, and widened dark area of photoreceptors (edema), while there was no obvious foveal edema were observed. The retinal images in other locations were normal. The average macular foveal thickness in the groups of temporosuperior artery occlusion, temporoinferior artery occlusion and retina arteriole occlusion were (161.11plusmn;17.66) mu;m, (148.38plusmn;18.48) mu;m and (136.29plusmn;14.94) mu;m, respectively (F=4.137,P=0.031,Pgt;0.01). There was no correlation of visual acuity with retinal thickness in 24 eyes (r＝0.285，P＝0.176，Pgt;0.01). Conclusion OCT could display the pathological changes of retinal tissue of BRAO in vivo. The increases of macular foveal thicknesses in BRAO eyes are not so obvious, and no correlations could be seen between visual acuity and macular foveal thickness. OCT is indicated on the old patients and the patients with systemic diseases for whom FFA is contraindicated. The unique characteristics of pathological changes of BRAO indicated by OCT images supply the objective signs for the instant clinical diagnosis. (Chin J Ocul Fundus Dis, 2007, 23: 173-176)
Objective To study the characteristics of optic al coherence tomography (OCT) in idiopathic macular epiretinal membranes (IMEM) and the relationship between the thickness of fovea and the vision of affected eyes. Methods Total of 67 cases (73 eyes) with clinica l diagnosis of IMEM by direct, indirect ophthalmoscopy, three mirror contact len s, fundus color photography or fundus fluorescein angiography(FFA）were examined with OCT. Results Epiretinal membranes(ERMs) with macular edema were found in 32 eyes, proliferative ERMs in 20 eyes, ERMs with macular pseudoholes in 14 eyes and ERMs with laminar macular holes in 7 eyes. Based on OCT, the ERMs were clearly and partially seperated from the retina (27 eyes, 38.36%), the retinal thickness of the fovea was the thickest in proliferative ERMs and the thinnest in ERMs with laminar macular holes. The statistical an alysis showed there was a negative correlation between the thickness of fovea an d visual acuity (r=－0.454, P= 0.000 ). Conclusion There were four types of image of OCT in IMEM: ERMs with macularedema, proliferative ERMs, ERMs with macular pseudohole and ERMs with laminar macular hole；and the thicker the fovea under the OCT, the poorer th e visual acnity in the affected eyes with ERMs. (Chin J Ocul Fundus Dis, 2001,17:115-118)
Objective To investigate the characteristics of congenital retinoschisis of optical coherence tomography(OCT) and its clinical application. Methods Eight cases(15 eyes) which were diagnosed as or suspected to retinoschisis in clinic were examined by OCT,direct ophthalmoscopy and color fundus photograph.Three cases(6 eyes) were examined by electroretinogram(ERG) and fundus fluorescein angiography(FFA). Results The typical characteristic OCT images of congenital retinoschisis were cystic maculopathy with tilted and vertical connective filaments,typical split in innner retinal layers in posterior retina and thickening of neurosensory retina with the split of outer retinal layers in membranous remnants. Conclusions OCT can display the characteristics of congenital retinoschisis．It is potentially useful as a new technique for the diagnosis of congenital retinoschisis. (Chin J Ocul Fundus Dis, 1999, 15: 209-211)