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pupil dilation

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https://www.readbyqxmd.com/read/28919703/quality-and-learning-curve-of-handheld-versus-stand-alone-non-mydriatic-cameras
#1
Mariya Gosheva, Christian Klameth, Lars Norrenberg, Lucien Clin, Johannes Dietter, Wadood Haq, Iliya V Ivanov, Focke Ziemssen, Martin A Leitritz
PURPOSE: Nowadays, complex digital imaging systems allow detailed retinal imaging without dilating patients' pupils. These so-called non-mydriatic cameras have advantages in common circumstances (eg, for screening or emergency purposes) but present limitations in terms of image quality and field of view. We compare the usefulness of two non-mydriatic camera systems (ie, a handheld versus a stand-alone device) for fundus imaging. The primary outcome was image quality. The secondary outcomes were learning effects and quality grade-influencing factors...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28917402/intracameral-mydriatics-versus-topical%C3%A2-mydriatics-in-pupil-dilation-for%C3%A2-phacoemulsification-cataract-surgery
#2
Amelia Lim Lay Suan, Jemaima Che Hamzah, Tan Soo Ken, Vanessa Naseem Mansurali
PURPOSE: To evaluate the efficacy and safety of intracameral mydriatics (lidocaine 1.0% and phenylephrine 1.5%) versus topical mydriatics (phenylephrine 2.5% and tropicamide 1.0%) in pupil dilation for phacoemulsification surgery in Malaysians. SETTING: Department of Ophthalmology, Penang General Hospital, Georgetown Penang, Malaysia. DESIGN: Prospective comparative case series. METHOD: Patients with immature cataract were randomized to the topical mydriatic group (topical group) or intracameral mydriatic group (intracameral group)...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28903962/an-evaluation-of-intracameral-mydriasis-for-routine-cataract-surgery
#3
Christopher B Schulz, Srini V Goverdhan, Roger C Humphry
BACKGROUND: Intracameral Mydrane might facilitate a more streamlined cataract service and improve the patient experience. There is limited 'real-world' evidence of its use in a UK setting. METHODS: As part of a local evaluation of cataract surgery using intracameral Mydrane (group 2; n=60), data were collected on intraoperative pupil size and postoperative visual acuity (VA), as well as the rate of mechanical pupil dilation, intraoperative floppy iris syndrome (IFIS) and complications...
September 13, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28894216/correlative-evaluation-of-mental-and-physical-workload-of-laparoscopic-surgeons-based-on-surface-electromyography-and-eye-tracking-signals
#4
Jian-Yang Zhang, Sheng-Lin Liu, Qing-Min Feng, Jia-Qi Gao, Qiang Zhang
Surgeons' mental and physical workloads are major focuses of operating room (OR) ergonomics, and studies on this topic have generally focused on either mental workload or physical workload, ignoring the interaction between them. Previous studies have shown that physically demanding work may affect mental performance and may be accompanied by impaired mental processing and decreased performance. In this study, 14 participants were recruited to perform laparoscopic cholecystectomy (LC) procedures in a virtual simulator...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28890309/pupillary-response-to-nitrous-oxide-administration-in-cataract-surgery-under-general-anesthesia
#5
Mansoor Masjedi, Alireza Ghanbari, Hossein Haddad Bakhodaei, Tahere Jowkar, Vahhab Hosseni, Mahnaz Rakhshan
BACKGROUND: Despite recent innovations in cataract surgery, pupillary diameter is one of the most important affecting factors in outcome of this surgery. As cataract surgery is performed ideally when the pupil is sufficiently dilated, anesthesia may contribute significantly in success or failure of this operation. This study was performed to evaluate the effect of nitrous oxide on pupillary diameter in cataract surgery under general anesthesia. METHODS: Forty patients with cataract, scheduled for operation under general anesthesia, were randomly allocated into two groups...
September 7, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28888155/pupil-response-and-attention-skills-in-down-syndrome
#6
Armando Quetzalcóatl Angulo-Chavira, Octavio García, Natalia Arias-Trejo
Down syndrome (DS) is characterized by attentional problems. Little is known about the neural correlates of attention problems in DS due to difficulties in evaluation. Pupil dilation, associated with an increase in cognitive load and locus coeruleus-noradrenaline system activity in humans, is a neurophysiological measurement that may help to characterize such problems. The aim of this research was to investigate the link between a phasic pupil dilation response and target detection in people with DS, as compared with a control group with typical development (TD) matched by mental age...
September 6, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/28869841/effects-of-attention-on-the-speech-reception-threshold-and-pupil-response-of-people-with-impaired-and-normal-hearing
#7
Thomas Koelewijn, Niek J Versfeld, Sophia E Kramer
For people with hearing difficulties, following a conversation in a noisy environment requires substantial cognitive processing, which is often perceived as effortful. Recent studies with normal hearing (NH) listeners showed that the pupil dilation response, a measure of cognitive processing load, is affected by 'attention related' processes. How these processes affect the pupil dilation response for hearing impaired (HI) listeners remains unknown. Therefore, the current study investigated the effect of auditory attention on various pupil response parameters for 15 NH adults (median age 51 yrs...
August 30, 2017: Hearing Research
https://www.readbyqxmd.com/read/28868171/complication-of-peribulbar-block-brainstem-anaesthesia
#8
Leyla Kazancıoğlu, Şule Batçık, Hızır Kazdal, Ahmet Şen, Berrak Şekeryapan Gediz, Başar Erdivanlı
Peribulbar block is used to obtain anaesthesia and akinesia of the eye by injecting a local anaesthetic around the musclecone. A patient scheduled for cataract surgery received peribulbar block with 6 mL of 2% lidocaine hydrochloride. Following the injection, confusion, hypotension and dilatation of the contralateral pupil rapidly progressed to loss of consciousness and respiratory arrest. The patient was intubated and mechanically ventilated for 30 min. The patient regained her consciousness, was extubated and transferred to the intensive care unit for further follow-up...
August 2017: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/28864843/pupillary-autonomic-dysfunction-in-patients-with-anca-associated-vasculitis
#9
Philipp Moog, O Eren, S Kossegg, K Valda, A Straube, M Grünke, H Schulze-Koops, M Witt
OBJECTIVE: To assess autonomic function by infrared dynamic pupillometry in patients with ANCA-vasculitis (AAV) in correlation to autonomic symptoms, disease specific clinical parameters and cardiovascular reflex tests. METHODS: Patients with AAV and healthy controls underwent pupillometry at rest and after sympathetic stimulation (cold pressor test). Three parasympathetic parameters (amplitude, relative amplitude, maximum constriction velocity) and one sympathetic parameter (late dilatation velocity) were assessed...
September 1, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28863141/assessment-of-tilt-and-decentration-of-crystalline-lens-and-intraocular-lens-relative-to-the-corneal-topographic-axis-using-anterior-segment-optical-coherence-tomography
#10
Shuhei Kimura, Yuki Morizane, Yusuke Shiode, Masayuki Hirano, Shinichiro Doi, Shinji Toshima, Atsushi Fujiwara, Fumio Shiraga
PURPOSE: To investigate the tilt and decentration of the crystalline lens and the intraocular lens (IOL) relative to the corneal topographic axis using anterior segment ocular coherence tomography (AS-OCT). METHODS: A sample set of 100 eyes from 49 subjects (41 eyes with crystalline lenses and 59 eyes with IOLs) were imaged using second generation AS-OCT (CASIA2, TOMEY) in June and July 2016 at Okayama University. Both mydriatic and non-mydriatic images were obtained, and the tilt and decentration of the crystalline lens and the IOL were quantified...
2017: PloS One
https://www.readbyqxmd.com/read/28860924/frontalis-sling-surgery-a-treatment-modality-for-cyclic-oculomotor-nerve-palsy
#11
Smriti Bansal, Sima Das
Cyclic oculomotor nerve paresis and spasm are a rare disorder characterized by alternating spastic and paretic phase of the muscles supplied by the oculomotor nerve. A 26-year-old male presented with abnormal right eyelid movements since early childhood. Examination findings were consistent with diagnosis of right eye cyclic oculomotor nerve palsy. A paretic phase with complete upper eyelid ptosis, exotropia, hypotropia and dilatation of the pupil was followed by a phase of orthotropia, the absence of ptosis and normal pupil size...
July 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28860657/pupil-response-components-attention-light-interaction-in-patients-with-parinaud-s-syndrome
#12
Paola Binda, Torsten Straßer, Krunoslav Stingl, Paul Richter, Tobias Peters, Helmut Wilhelm, Barbara Wilhelm, Carina Kelbsch
Covertly shifting attention to a brighter or darker image (without moving one's eyes) is sufficient to evoke pupillary constriction or dilation, respectively. One possibility is that this attentional modulation involves the pupillary light response pathway, which pivots around the olivary pretectal nucleus. We investigate this possibility by studying patients with Parinaud's syndrome, where the normal pupillary light response is strongly impaired due to lesions in the pretectal area. Four patients and nine control participants covertly attended (while maintaining fixation at the center of a monitor screen) to one of two disks located in the left and right periphery: one brighter, the other darker than the background...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28851872/human-eyes-with-dilated-pupils-induce-pupillary-contagion-in-infants
#13
Christine Fawcett, Melda Arslan, Terje Falck-Ytter, Herbert Roeyers, Gustaf Gredebäck
Being sensitive and responsive to others' internal states is critical for social life. One reliable cue to what others might be feeling is pupil dilation because it is linked to increases in arousal. When adults view an individual with dilated pupils, their pupils dilate in response, suggesting not only sensitivity to pupil size, but a corresponding response as well. However, little is known about the origins or mechanism underlying this phenomenon of pupillary contagion. Here we show that 4- to 6-month-old infants show pupillary contagion when viewing photographs of eyes with varying pupil sizes: their pupils dilate in response to others' large, but not small or medium pupils...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28845321/evaluation-of-anterior-segment-changes-of-patients-taking-alpha1-blockers-by-ultrasound-biomicroscopy-in-the-drug-free-period
#14
Yeliz Acar, Kadir Eltutar, Sibel Zırtıloğlu
OBJECTIVES: To evaluate and compare anterior segment changes in patients taking alpha-1 (α1) blockers (tamsulosin, terazosin, doxazosin, alfuzosin) for benign prostatic hypertrophy, during drug intake and drug-free period, using ultrasound biomicroscopy (UBM). MATERIALS AND METHODS: In this prospective study, UBM was done before and after pupil dilatation in 31 phakic eyes of 19 male patients taking α1-blockers. Undilated and dilated UBM was repeated before cataract extraction, after stopping the drug for 10 days...
August 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28835810/the-eye-pupil-s-response-to-static-and-dynamic-illusions-of-luminosity-and-darkness
#15
Daniele Zavagno, Luca Tommasi, Bruno Laeng
Pupil diameters were recorded with an eye-tracker while participants observed cruciform patterns of gray-scale gradients that evoked illusions of enhanced brightness (glare) or of enhanced darkness. The illusions were either presented as static images or as dynamic animations which initially appeared as a pattern of filled squares that-in a few seconds-gradually changed into gradients until the patterns were identical to the static ones. Gradients could either converge toward the center, resulting in a central region of enhanced, illusory, brightness or darkness, or oriented toward each side of the screen, resulting in the perception of a peripheral ring of illusory brightness or darkness...
July 2017: I-Perception
https://www.readbyqxmd.com/read/28822439/-multisystemic-smooth-muscle-dysfunction-syndrome-in-children-a-case-report-and-literature-review
#16
Y L Zhou, Y Y Zhang, B L Cheng, D Xu, L F Tang, Z M Chen
Objective: To analyze the clinical characteristics and diagnosis of multisystemic smooth muscle dysfunction syndrome(MSMDS). Method: Clinical data of a case diagnosed as MSMDS and hospitalized in our hospital in July 2016 was retrospectively analyzed. Literature search was performed at databases of PubMed, Wanfang, China National Knowledge Infrastructure and VIP with the key words "multisystemic smooth muscle dysfunction syndrome" "ACTA2" . The literature retrieval was confined from January 1980 to November 2016...
August 2, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/28821719/neural-physiological-and-behavioral-correlates-of-visuomotor-cognitive-load
#17
S M Hadi Hosseini, Jennifer L Bruno, Joseph M Baker, Andrew Gundran, Lene K Harbott, J Christian Gerdes, Allan L Reiss
Visuomotor ability is quite crucial for everyday functioning, particularly in driving and sports. While there is accumulating evidence regarding neural correlates of visuomotor transformation, less is known about the brain regions that accommodate visuomotor mapping under different cognitive demands. We concurrently measured cortical activity and pupillary response, using functional near infrared spectroscopy (fNIRS) and eye-tracking glasses, to examine the neural systems linked to pupil dilation under varying cognitive demands...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814824/cataract-surgery-in-patients-with-pseudoex-foliation-syndrome-current-updates
#18
REVIEW
Luigi Fontana, Marco Coassin, Alfonso Iovieno, Antonio Moramarco, Luca Cimino
Pseudoexfoliation is a ubiquitous syndrome of multifactorial origin affecting elderly people by increasing the risk of cataract and secondary glaucoma development. Despite modern techniques and technologies for cataract surgery, pseudoexfoliation syndrome represents a challenge for surgeons because of the increased weakness of the zonular apparatus and limited pupil dilation. Due to the inherent difficulties during surgery, the risk of vitreous loss in these patients is several times higher than in cataract patients without pseudoexfoliation...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28808605/fatal-cerebral-swelling-immediately-after-cranioplasty-a-case-report
#19
Yuta Kaneshiro, Keiji Murata, Shigeru Yamauchi, Yumiko Urano
BACKGROUND: Cranioplasty is a standard neurosurgical procedure which is performed after decompressive craniotomy. Fatal complications associated with this procedure are not well documented. Here, we report a case of fatal cerebral swelling after cranioplasty and discuss the possible mechanism of this complication. CASE DESCRIPTION: A 64-year-old man was admitted with the diagnosis of cerebral hemorrhage, and emergency surgery for hemorrhage removal and decompressive craniotomy were performed...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28807373/usefulness-of-cocaine-drops-in-investigating-infant-anisocoria
#20
Gilles C Martin, Pierre-Antoine Aymard, Charlotte Denier, Caroline Seghir, Marc Abitbol, Nathalie Boddaert, Dominique Bremond-Gignac, Matthieu P Robert
INTRODUCTION: Whereas apraclonidine has eclipsed cocaine test in the exploration of unilateral miosis in adults, its use in infants is avoided because of the risk of central nervous system depression. This chart review evaluates the usefulness of cocaine drops in infants. METHODS: Infants under the age of one referred for unilateral miosis between November 1, 2009 and November 1, 2015, were reviewed. Patients underwent the following protocol: (1) in case of isolated miosis, cocaine test was performed...
August 4, 2017: European Journal of Paediatric Neurology: EJPN
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