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Do users tend to consume only like-minded political information online? We point to two problems with the existing knowledge about this debate. First, the measurement of media preferences by the typical means of surveys is less reliable than behavioral data. Second, most studies have analyzed only the extent of online exposure to like-minded content, not the users’ complete web-browsing repertoire. This study used both survey data and real-life browsing behavior (661,483 URLs from 15,976 websites visited by 402 participants) for the period 7 weeks prior to the 2013 Israeli national elections. The results indicate that (1) self-report measurements of ideological exposure are inflated, (2) exposure to online ideological content accounted for only 3% of total online browsing, (3) the participants’ media repertoires are very diverse with no evidence of echo chambers, and (4) in accordance with the selective exposure hypothesis, individuals on both sides are more exposed to like-minded content. The results are discussed in light of the selective exposure literature. [ABSTRACT FROM AUTHOR]

Background: The causative role of diffuse macular edema in various etiologies is often undetermined., Objectives: To describe an association between extrafoveal vitreous traction and non-diabetic diffuse macular edema secondary to various ocular entities., Methods: In a retrospective study of eyes with non-diabetic diffuse macular edema, charts and optical coherence tomography scans demonstrating extrafoveal vitreous traction were analyzed. Excluded were diabetic patients and eyes that had vitreofoveal traction. A control group (n = 12) allowed for mapping of normal macular thickness., Results: Five eyes with macular edema were associated with extrafoveal traction, each secondary to and representing a different etiology. The causes were penetrating injury, cataract extraction, branch retinal vein occlusion, central retinal vein occlusion, and idiopathic. Vitreous traction was detected either at the papillomacular bundle (n = 3), superonasally to the fovea (n = 1), and at the optic nerve head (n = 1). The associated retinal edema (all eyes) and serous retinal detachment (four eyes) at the traction sites were in continuum with the foveal edema in each eye, manifesting as diffuse macular edema. Of the two modalities--the OCT-Line group program and the OCT-Automatic central program--only the former enabled detection of extrafoveal traction in each., Conclusions: Diffuse macular edema secondary to various ocular diseases may be associated with extrafoveal vitreous traction. The OCT-Automatic central program may omit some of these extrafoveal traction sites. Further studies are required to validate these findings and to assess whether early vitrectomy may improve visual prognosis in these eyes.