1,720,971 research outputs found
I-LASIK retreatment of residual refractive errors after microkeratome and femtosecond assisted LASIK
No full textPurpose To evaluate the efficacy and safety of femtosecond-assisted sub-bowman keratomileusis (I-LASIK) retreatment for residual refractive errors after either I-LASIK or microkeratome assisted LASIK.
Methods We performed i-lasik retreatment in 14 eyes of 10 patients (mean age 37) for residual myopic and astigmatic refractive errors after previous both i-lasik and lasik procedures. All patients had stable residual refractive errors for at least 2 years. I-lasik was performed in all cases with AMO's IntraLaseTM FS and STAR S4 IRTM Excimer Laser System, corneal flap thickness was 100μm and hinge position was 90 degrees with reverse 120° side cut. The optical zone of the ablation was from 6.5 to 7 mm, transition zone from 8 to 9 mm.
Results Controls were made at 1day, 1 and 3 months. Anterior segment OCT and corneal confocal microscopy were performed in every case. No flap decentration was observed in any case, we had 2 cases of epithelial ingrowth, 4 cases of dry eye, no cases of corneal ectasia and no retinal complications. All spherical equivalent results were within 0.50 diopters.
Conclusion In our experience I-lasik procedure demonstrated itself to be safe and effective also in patients with residual refractive errors from previous i-lasik and lasik treatments
Atlas Of Pediatric Ocular Oncology
No full textThis atlas-book was conceived in the dark evenings during the Covid pandemic to keep the
mind busy, not only mine but also the young residents of our clinic.
The images that enrich each chapter are part of a life of over 30 years dedicated to ocular
oncology, mainly of the pediatric age.
A passion and commitment transmitted by my mentor Prof. Frezzotti who treated the first
retinoblastoma in 1959.
So here, I find myself collecting the most significant images of hundreds of clinical cases
faced, diagnosed and treated over the years.
Retinoblastoma is obviously the largest part of this atlas due to the over 900 cases observed
and treated in Siena.
It took almost 3 years...because unfortunately the time left to write, study and publish is
the evening hours after long and tiring days of clinical care activities.
My long friendship, collaboration and growth together with Paolo Galluzzi has allowed us
to add to each chapter MRI notions useful in the differential diagnosis of various pathologies.
My friend Rana’a helped correct some chapters and give his contribution on ocular mela-
noma in pediatric age.
Good friends and colleagues have been added among the collaborators for sending unu-
sual and rare cases.
I thank Tero Kivela, Sonia De Francesco, Tommaso Bacci, Marco Mazza, Mattia Pasti,
Alfonso Cerase, Lucia Monti, Mario Fruschelli and Cristina Menicacci for their precious
contributions.
An affectionate thought goes to all the young residents who, with great enthusiasm, em-
braced the topics assigned to them and carried out the various chapters with curiosity and
interest.
The drawings were all done by the talented resident Dimitris Pollalis who gave a truly
artistic touch to this atlas.
This book is dedicated to all ophthalmologists, of all ages, who are passionate, curious and
fascinated by their work with the hope that the hundreds of images can help to recognize
unusual and complex cases
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
Sub Bowman's keratomileusis for the correction of anisometropia after penetrating and lamellar corneal surgery
No full textPurpose To report the use of Sub Bowman's Keratomileusis (SBK) in the treatment of anisometropia subsequent to Perforating Keratoplasty (PK) and Deep Anterior Lamellar Keratoplasty(DALK).
Methods Three patients with compound myopic and hyperopic astigmatism after PK and DALK were submitted to SBK. Treatments were conducted under topical anaesthesia. Femtosecond laser (IntraLase FS., AMO Inc, CA, USA) was used to create a superiorly hinged anterior lamellar flap at 100 microns in a 7.75/8 mm zone. The flap was lifted and a customized wavefront ablation was performed in two cases with the Star S4IR (CustomVue, AMO Inc., CA, USA), and in one case with Technolas z100 (Zyoptix Custom Wavefront, Bausch & Lomb Inc, NY, USA). The flap was then replaced, and the interface was irrigated. Minimum residual pachimetry value was estimated not inferior to 400μm.
Results Postoperative controls at 1 and 3 months showed a reduction of anisometropia up to 70% with residual spherical equivalent (SE) not superior to 2.50 diopters
Conclusion Sub Bowman's Keratomileusis has been shown to be safe and effective to reduce anisometropia in patients who have previously undergone to PK and DALK
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
In vivo confocal microscopy evaluation of morpho-functional correlations of filtering blebin glaucomatous patients
No full textAppropriate 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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