We prove that the pleated hyperbolic paraboloid, a familiar origami model known since 1927, in fact cannot be folded with the standard crease pattern in the standard mathematical model of zero-thickness paper. In contrast, we show that the model can be folded with additional creases, suggesting that real paper “folds” into this model via small such creases. We conjecture that the circular versi...

Takkar B, et al. BMJ Case Rep 2017. doi:10.1136/bcr-2017-221761 Description A 78-year-old male presented with blurring of vision in right eye (RE) since 2 months. He was diagnosed to have retinal detachment in RE 27 years ago, which had been successfully repaired with scleral buckling surgery. Retinal holes had been treated with laser prophylaxis in left eye (LE). On examination, visual acuity ...

PURPOSE The purposes of this study were to examine patterns of objectively measured sedentary behavior in a national cohort of US middle-age and older adults and to determine factors that influence prolonged sedentary behavior. METHODS We studied 8096 participants from the REasons for Geographic and Racial Differences in Stroke (REGARDS) Study, a population-based study of black and white adul...

BACKGROUND It is unclear whether or not an additional encircling band improves outcome in vitrectomy for pseudophakic retinal detachment (PRD). Also unclear is whether small gauge transconjunctival trocar-guided vitrectomy is as successful as conventional 20 gauge (G) vitrectomy. METHODS 257 adult patients with uncomplicated PRD were enrolled in 14 vitreoretinal centres across Germany. Contin...

Buckling procedures are useful in securing successful re-attachment of the retina. Apart from their role in ensuring a contact between the retina and the choroid during the postoperative healing period, they also help to relax the pull exerted by the vitreous on the retina. When the traction exerted by the vitreous on the retina is marked, it is desirable to aim at a permanent buckling by the u...

Introduction: The retinal changes following scleral buckling surgery (SBS) for rhegmatogenous detachment (RRD) have been rarely evaluated with optical coherence tomography angiography (OCTA).
 Methods: A 40 years old male presented subtotal RD involving the macula and had best corrected visual acuity of logmar 2.3 in affected right eye. Five months after applying 120 degree buckle, swept s...

Pierre VIKTOROVITCH DR CNRS Ecole Centrale de Lyon Président Henri BENISTY Professeur Institut d’Optique Rapporteur Olivier PARRIAUX Professeur Université St-Etienne Rapporteur Joseph ZYSS Professeur Institut d’Alembert Examinateur Frank VOLLMER Ass. Professeur Max Planck Institute Examinateur Malcolm BUCKLE DR CNRS ENS Cachan Examinateur Chi Thanh NGUYEN IR CNRS ENS Cachan Encadrant de thèse I...