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Saurabh Choudhry, Neha Goel, Aanchal Mehta, Nidhi Mahajan
Postoperative opacification of a hydrophilic acrylic intraocular lens (IOL) is an uncommon complication. A 57-year-old diabetic female who had undergone phacoemulsification with IOL implantation in her right eye 16 years back presented with diminution of vision in the same eye for 3 years. Significant IOL opacification was observed clinically and anterior segment optical coherence tomography clearly delineated the intraoptic deposits, sparing the haptics, and edges of the optic. IOL explant and exchange was performed leading to restoration of visual acuity to 6/9...
June 2018: Indian Journal of Ophthalmology
Takayuki Baba, Tomohiro Nizawa, Toshiyuki Oshitari, Shuichi Yamamoto
Purpose: To compare the visual and surgical outcomes after a reuse or a replacement of a dislocated in-the-bag intraocular lens (IOL). Methods: This was a retrospective, nonrandomized case series at a single ophthalmological institution. Cases with an in-the-bag dislocation of an IOL were treated by pars plana vitrectomy and the reuse or the replacement of the IOL. The lens was held by intrascleral fixation of the haptics of the IOL under both conditions. The same dislocated IOL was reused in 6 eyes (group A) or it was replaced with another IOL in the other 9 eyes (group B)...
2018: Journal of Ophthalmology
Gaetano Valenza, Alberto Greco, Matteo Bianchi, Mimma Nardelli, Simone Rossi, Enzo Pasquale Scilingo
Noninvasive, objective quantitative techniques to gauge emotional states are fundamental for clinical psychology as they overcome subjective bias of currently used questionnaires. To this end, we investigated brain oscillatory EEG activity during caresslike, affective haptic elicitation conveyed on the forearm at two force (strength of the caress) and three velocity (velocity of the caress) levels. Thirty-two healthy subjects (16 female) were asked to assess each haptic stimulus in terms of arousal (i.e., intensity of emotional perception) and valence (i...
May 20, 2018: Psychophysiology
Helena Yuri Kurimori, Makoto Inoue, Akito Hirakata
Purpose: To report the findings and surgical techniques on two cases of severe tilting of an intraocular lens (IOL) that had been implanted with intrascleral fixation and the tilting was detected by anterior segment optical coherence tomography (AS-OCT). Observations: Two patients underwent flanged intrascleral fixation of an IOL with the double needle technique. AS-OCT showed that the tilt of IOL was 25.3° in Case 1 and was 38.1° in Case 2, and a second surgery was planned to reduce the IOL tilt...
June 2018: American Journal of Ophthalmology Case Reports
Nasrina Parvin, Shiv Pal, Jorge Echeverría, Santiago Alvarez, Shabana Khan
Previous theoretical and experimental endeavors suggested that [Cu(C6 H6 )]+ prefers the η1 /η2 mode over the η6 mode due to the augmented repulsion between the benzene ring and metal d-electrons. Nevertheless, the use of silylene as a neutral ligand has led to the isolation of the first monomeric copper cation, [{PhC(N t Bu)2 SiN(SiMe3 )2 }Cu(η6 -C6 H6 )]+ [SbF6 ]- ( 3 ), where a copper atom is bound to the benzene ring in an unsupported η6 fashion. However, the use of IPr (1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) in place of silylene results in the formation of [IPr·Cu(η2 -C6 H6 )]+ [SbF6 ]- ( 6 ), where the copper atom is bound to the benzene ring in the η2 mode...
May 14, 2018: Chemical Science
Dooho Brian Kim
The Yamane double-needle intrascleral haptic fixation technique for posterior chamber intraocular lens (IOL) fixation in the setting of absent or inadequate capsule support is a minimally invasive IOL fixation technique that requires scleral incisions using needles to externalize the IOL haptics. Despite being a seemingly easy and intuitive procedure, there are significant challenges when learning this technique. The most difficult step is threading the trailing haptic with the needle for fixation. If using an IOL with weak haptics, this step can result in haptic kink or breakage, which renders the haptics useless for this technique and necessitating explantation of the IOL...
April 2018: Journal of Cataract and Refractive Surgery
Claudia Geitner, Stewart Birrell, Claudia Krehl, Paul Jennings
OBJECTIVE: This study investigates the influence of shoe type (sneakers and safety boots), age, and gender on the perception of haptic pulse feedback provided by a prototype accelerator pedal in a running stationary vehicle. BACKGROUND: Haptic feedback can be a less distracting alternative to traditionally visual and auditory in-vehicle feedback. However, to be effective, the device delivering the haptic feedback needs to be in contact with the person. Factors such as shoe type vary naturally over the season and could render feedback that is perceived well in one situation, unnoticeable in another...
June 2018: Human Factors
Raz Leib, Inbar Rubin, Ilana Nisky
Interaction with an object often requires the estimation of its mechanical properties. We examined whether the hand that is used to interact with the object and their handedness affected people's estimation of these properties using stiffness estimation as a test case. We recorded participants' responses on a stiffness discrimination of a virtual elastic force field and the grip force applied on the robotic device during the interaction. In half of the trials, the robotic device delayed the participants' force feedback...
May 16, 2018: Journal of Neurophysiology
Hadley S Clayton, Kgaugelo C Tapala, Andreas Lemmerer
In the title compound, [OsBr(C10 H14 )(C7 H5 O2 )], the central OsII ion is ligated by a hexa-haptic η6 p -cymene ring, a Br- ligand and two O atoms of a chelating tropolonate group. The p -cymene ligand presents more than one conformation, giving rise to a discrete disorder, which was modelled with two different orientations with occupancy values of 0.561 (15) and 0.439 (15). The crystal packing features C-H⋯O and C-H⋯Br hydrogen bonding. Aromatic π-π stacking inter-actions are also observed between adjacent non-benzenoid aromatic tropolone rings...
March 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
K Lee, M Kim, K Kim
BACKGROUND: Skin surface evaluation has been studied using various imaging techniques. However, all these studies had limited impact because they were performed using visual exam only. To improve on this scenario with haptic feedback, we propose 3D reconstruction of the skin surface using a single image. Unlike extant 3D skin surface reconstruction algorithms, we utilize the local texture and global curvature regions, combining the results for reconstruction. MATERIALS AND METHODS: The first entails the reconstruction of global curvature, achieved by bilateral filtering that removes noise on the surface while maintaining the edge (ie, furrow) to obtain the overall curvature...
May 11, 2018: Skin Research and Technology
Ming Hong, Zhe Cai, Lei Song, Yongqiang Liu, Qi Wang, Xiangfei Feng
Nonalcoholic fatty liver disease (NAFLD) is the most common type of liver disease in developed countries. Oxidative stress plays a critical role in the progression of NAFLD. Modern pharmacological study and clinical trials have demonstrated the remarkable antioxidant activity of Gynostemma pentaphyllum (GP) in chronic liver disease. One aim of this study was to explore the potential protective effects and mechanisms of action of GP extract on NAFLD. The in vivo results showed that GP extract could alleviate fatty degeneration and haptic fibrosis in NAFLD mice...
2018: Evidence-based Complementary and Alternative Medicine: ECAM
Xi Zhang, Xun Chen, Xiaoying Wang, Fei Yuan, Xingtao Zhou
BACKGROUND: To analyze the positions of intraocular posterior Implantable Collamer Lens (ICL) and its possible relationship with vault. METHODS: This cross-sectional study included 72 patients with high myopia (134 eyes) who were followed up after phakic intraocular lens implantation. The postoperative time ranged from 1 week to 7 years. We obtained the images of ICL by using Compact Touch STS UBM and observed the position of ICL in posterior chamber and ciliary sulcus...
May 9, 2018: BMC Ophthalmology
J Zundel, S A Ansari, H M Trivedi, J G Masters, S Mascaro
BACKGROUND: The purpose of this research is to characterize the effects of mouthwash solutions on oral friction and moisture using a quantitative in vitro approach. MATERIALS AND METHODS: The frictional coefficient of in vitro porcine tongue samples was measured using a magnetic levitation haptic device equipped with a custom tactor designed to mimic human skin. A commercially available moisture meter was used to measure moisture content of the samples. Tongue samples were first tested before treatment, then after application of saliva (either human or artificial), and again after application of 1 of 11 different mouthwash solutions...
May 7, 2018: Skin Research and Technology
Cari Pérez-Vives
There is strong evidence that the IOL material is the factor having the greatest impact on posterior capsule opacification (PCO), anterior capsule opacification (ACO) development, and glistening formation after cataract surgery, even though there are other IOL features-such as haptic material and design and edge and optic design-that also have some influence. We reviewed the published literature describing the adverse events that are mainly related to the intraocular lens (IOL) material, such as PCO, ACO, and the subsequent capsule contraction, as well as glistening formation...
2018: Journal of Ophthalmology
Annie Vinter, Patrick Bonin, Pascal Morgan
BACKGROUND AND AIMS: Astonishing drawing capacities have been reported in children with early visual impairments. However, most of the evidence relies on single case studies. Hitherto, no study has systematically jointly investigated, in these children, the role of (1) the severity of the visual handicap, (2) age and (3) practice in drawing. The study aimed at revealing the specificities of the drawing in children deprived from vision, as compared to children with less severe visual handicap and to sighted children performing under haptic or usual visual control...
May 3, 2018: Research in Developmental Disabilities
Nils Gessert, Jens Beringhoff, Christoph Otte, Alexander Schlaefer
PURPOSE: Estimating the interaction forces of instruments and tissue is of interest, particularly to provide haptic feedback during robot-assisted minimally invasive interventions. Different approaches based on external and integrated force sensors have been proposed. These are hampered by friction, sensor size, and sterilizability. We investigate a novel approach to estimate the force vector directly from optical coherence tomography image volumes. METHODS: We introduce a novel Siamese 3D CNN architecture...
May 4, 2018: International Journal of Computer Assisted Radiology and Surgery
Eefje G J Roelofsen, Derrick D Brown, Maria W G Nijhuis-van der Sanden, J Bart Staal, Ruud G J Meulenbroek
The motor system's natural tendency is to move the limbs over equal amplitudes, for example in walking. However, in many situations in which people must perform complex movements, a certain degree of amplitude differentiation of the limbs is required. Visual and haptic feedback have recently been shown to facilitate such independence of limb movements. However, it is unknown whether motor expertise moderates the extent to which individuals are able to differentiate the amplitudes of their limb-movements while being supported with visual and haptic feedback...
April 30, 2018: Human Movement Science
Bing Wu, Roberta L Klatzky
Stiffness of many materials follows Hooke's Law, but the mechanism underlying the haptic perception of stiffness is not as simple as it seems in the physical definition. The present experiments support a model by which stiffness perception is adaptively updated during dynamic interaction. Participants actively explored virtual springs and estimated their stiffness relative to a reference. The stimuli were simulations of linear springs or nonlinear springs created by modulating a linear counterpart with low-amplitude, half-cycle (Experiment 1) or full-cycle (Experiment 2) sinusoidal force...
May 3, 2018: Journal of Experimental Psychology. Human Perception and Performance
Isao Yokoi, Atsumichi Tachibana, Takafumi Minamimoto, Naokazu Goda, Hidehiko Komatsu
Material perception is an essential part of our cognitive function that enables us to properly interact with our complex daily environment. One important aspect of material perception is its multimodal nature. When we see an object, we generally recognize its haptic properties as well as its visual properties. Consequently, one must examine behavior using real objects that are perceived both visually and haptically to fully understand the characteristics of material perception. As a first step, we examined whether there is any difference in the behavioral responses to different materials in monkeys trained to perform an object grasping task in which they saw and grasped rod-shaped real objects made of various materials...
May 2, 2018: Journal of Neurophysiology
Annette Hagengruber, Hannes Höppner, Jörn Vogel
A key factor for reliable object manipulation is the tactile information provided by the skin of our hands. As this sensory information is so essential in our daily life it should also be provided during teleoperation of robotic devices or in the control of myoelectric prostheses. It is well-known that feeding back the tactile information to the user can lead to a more natural and intuitive control of robotic devices. However, in some applications it is difficult to use the hands as natural feedback channels since they may already be overloaded with other tasks or, e...
2018: Frontiers in Neurorobotics
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