Evaluation of Nonperfused Retinal Vessels in Ischemic Retinopathy

Evaluation of Nonperfused Retinal Vessels in Ischemic Retinopathy.

Purpose Retinal ischemia has been traditionally assessed by fluorescein angiography, visualizing perfused vessels. However, this method does not provide any information about nonperfused vessels, and although it is often assumed that vessels in ischemic areas regress, we know little about how nonperfused retinal vessels change over time. Here, we aim to learn more about the long-term fate of no...

Disorganized retinal lamellar structures in nonperfused areas of diabetic retinopathy.

PURPOSE To investigate morphologic changes on spectral-domain optical coherence tomography (SD-OCT) images in nonperfused areas (NPAs) in diabetic retinopathy (DR). METHODS One hundred eight consecutive eyes of 80 patients with diabetic ischemic maculopathy were retrospectively reviewed. The boundary between the nerve fiber layer (NFL) and the ganglion cell layer (GCL)/inner plexiform layer (...

Small retinal vessels extraction towards proliferative diabetic retinopathy screening

This paper introduces a systematic approach for segmentation of retinal blood vessels towards the diagnosis of proliferative diabetic retinopathy (PDR) from digital fundus images. Here, 2D-Match (Gabor) filters are used on digital fundus images in which the vessels are enhanced by contrast-limited adaptive histogram equalization (CLAHE). A double sided thresholding scheme is then used to segmen...

evaluation of sadr eminence in safavid period

چکیده: یکی از دوره های مهم تاریخی ایران به لحاظ تأمین استقلال ملی مذهبی و حتی تأثیر آن بر فرهنگ و مذهب ایرانیان، دوره صفویه است. رسمیت دادن و رواج مذهب شیعه توسط شاه اسماعیل اول، یکی از مهمترین اقدامات این دولت محسوب می شود. بنابراین برای اجرای این سیاست، وی منصب صدارت را به عنوان منصبی مذهبی- حکو متی ایجاد کرد .این منصب از دوره ی تیموریان ایجاد شده بود ولی در اواخر این دوره اهمیت بیشتری یافت...

Transpupillary Diode Laser Retinal Photocoagulation for the Treatment of Retinopathy of Prematurity: Experience in Southern Iran