1,720,964 research outputs found
Uveite anteriore acuta associata a nanoftalmo familiare: descrizione di cinque casi clinici
No full textVincitore miglior Poster Congressso S.O.I. (Società Italiana di Oftalmologia
Progression of the essential iris atrophy studied with confocal microscopy and ultrasound biomicroscopy: a five year case report
No full textPURPOSE: The purpose of this study was to report the progression of the iridocorneal endothelial syndrome during a 5-year period in a patient with the essential iris atrophy variant using confocal microscopy and ultrabiomicroscopy (UBM). METHODS: A 47-year-old woman was referred to us in January 2002 with suspected iridocorneal endothelial syndrome. Examination of both eyes included visual acuity, biomicroscopy, intraocular pressure measurement, gonioscopy, visual field test, and UBM. Afterward, she was examined yearly and confocal microscopy performed. RESULTS: Visual acuity was 20/20 in both eyes. Examination of the right eye revealed endothelial degeneration, peripheral anterior synechiae, and iris atrophy around the pupil that appeared displaced to the temporal side. Biomicroscopy of the left eye was unremarkable. Posterior segment was normal in both eyes. UBM of the right eye showed thickening of the iris adherent to the corneal endothelium. Diagnosis of essential iris atrophy was confirmed. One year later, the right eye showed increasing iridoendothelial adherences confirmed by UBM. Confocal microscopy revealed endothelial cell abnormalities and groups of endothelial "epithelium-like" cells with hyperreflective nuclei. In April 2007, the pupil appeared more temporally dislocated. UBM showed more extended synechiae. Confocal microscopy displayed hyporeflective opacities in the endothelial layer and many grouped keratocytic clusters in the posterior stroma. No alteration of the intraocular pressure and visual field was found during the follow-up. CONCLUSIONS: UBM and confocal microscopy permit observation of any corneal and iridocorneal angle changes and evaluation of essential iris atrophy progression. PMID: 19092417 [PubMed - indexed for MEDLIN
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Tangential retinal displacement increases after macular pucker surgery: An apparent nonsense
Full text linkPurpose: To measure the tangential retinal displacement and vision before and after macular pucker surgery and study if pars plana vitrectomy with epiretinal membrane peeling allows the reconstitution of previous anatomy or else it results in a different configuration. Methods: Retrospective series of patients undergoing pars plana vitrectomy for epiretinal membrane, with >6-month follow-up before and after surgery, complete with best-corrected visual acuity, optical coherence tomography, M-Charts, and infrared retinography. Tangential retinal displacement between earliest visit (T E ), time of surgery (T 0 ), and latest available visit (T L ) of the examined retina, concentric circles at 0.5, 1.5, and 4.5 mm radii, and the central horizontal and vertical meridians were measured. Tangential displacement was calculated as the optical flow of consecutive infrared photographs. Results: The study comprised 32 patients: 15 men and 17 women. Average preoperative and postoperative follow-up were 23.4 ± 27.9 months and 19.2 ± 11.8 months, respectively. Best-corrected visual acuity reduced before surgery (0.69 ± 0.16 Snellen to 0.46 ± 0.17; P < 0.001) and increased after (0.866 ± 0.16 Snellen; P < 0.001). Horizontal and vertical metamorphopsia increased between before surgery but only horizontal metamorphopsia significantly reduced after. Average tangential displacement before surgery was 35.6 ± 29.9 μ m versus 56.6 ± 41.3 μ m after ( P = 0.023). Preoperative and postoperative displacement within the fovea was less than over the entire area ( P < 0.001). Conclusion: Retinal tangential displacement between diagnosis and surgery (T E - T 0 ) is less than the displacement occurring after surgery (T 0 - T L ). Postoperative displacement does not represent the restoration of the anatomy existing before the disease ensued but rather the resulting equilibrium of newly deployed forces
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