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https://www.readbyqxmd.com/read/27915367/the-virtual-reality-head-mounted-display-oculus-rift-induces-motion-sickness-and-is-sexist-in-its-effects
#1
Justin Munafo, Meg Diedrick, Thomas A Stoffregen
Anecdotal reports suggest that motion sickness may occur among users of contemporary, consumer-oriented head-mounted display systems and that women may be at greater risk. We evaluated the nauseogenic properties of one such system, the Oculus Rift. The head-mounted unit included motion sensors that were sensitive to users' head movements, such that head movements could be used as control inputs to the device. In two experiments, seated participants played one of two virtual reality games for up to 15 min. In Experiment 1, 22% of participants reported motion sickness, and the difference in incidence between men and women was not significant...
December 3, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27875160/immersive-collaborative-analysis-of-network-connectivity-cave-style-or-head-mounted-display
#2
Maxime Cordeil, Tim Dwyer, Karsten Klein, Bireswar Laha, Kim Marriott, Bruce H Thomas
High-quality immersive display technologies are becoming mainstream with the release of head-mounted displays (HMDs) such as the Oculus Rift. These devices potentially represent an affordable alternative to the more traditional, centralised CAVE-style immersive environments. One driver for the development of CAVE-style immersive environments has been collaborative sense-making. Despite this, there has been little research on the effectiveness of collaborative visualisation in CAVE-style facilities, especially with respect to abstract data visualisation tasks...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27857427/generalized-aldis-theorem-for-calculating-aberration-contributions-in-freeform-systems
#3
Bo Chen, Alois M Herkommer
Compact folded imaging systems often require freeform surfaces to correct astigmatic and other off-axis aberrations. However, aberration theory for non-rotational symmetric systems is quite complex and it is especially hard to quantify individual surface aberration contributions. In this paper we develop a matrix method based on the propagation of a differential ray pair, which allows determining the aberration contribution of each individual surface for any ray. We can mathematically prove that the sum of the aberrations is identical to the exact ray-tracing result at the image plane...
November 14, 2016: Optics Express
https://www.readbyqxmd.com/read/27833004/the-effectiveness-of-google-glass-as-a-vital-signs-monitor-in-surgery-a-simulation-study
#4
Mohammed Husnain Iqbal, Abdullatif Aydin, Alexandra Lowdon, Hamza Ibn Ahmed, Gordon H Muir, M Shamim Khan, Prokar Dasgupta, Kamran Ahmed
INTRODUCTION: To assess the effectiveness of the Google GLASS as a vital signs monitor in a surgical setting and identify potential uses. METHODS: This prospective, observational and comparative study recruited novice (n = 24), intermediate (n = 8) and expert urologists (n = 5). All candidates performed a procedure on the GreenLight Simulator within a simulated setting using a standard vital signs monitor and then the Google GLASS. The time taken to respond to abnormal vital signs during both sessions was recorded...
November 7, 2016: International Journal of Surgery
https://www.readbyqxmd.com/read/27828253/design-fabrication-and-characterization-of-transparent-retro-reflective-screen
#5
Shoaib R Soomro, Hakan Urey
A transparent retro-reflective screen, which can be used as head-up-display (HUD) or a see-through screen for head mounted projection displays (HMPD) is proposed. The high optical gain of screen enables the use of low power projectors to produce very bright content. The screen assembly is based on retro-reflective microspheres, patterned on an optically clear substrate using steel stencil as a shadow mask. The incident light is retro-reflected as a narrow angular cone to create an eyebox for the viewer. The optical gain and transparency of screen is varied by changing the fill factor of the mask...
October 17, 2016: Optics Express
https://www.readbyqxmd.com/read/27810828/use-of-virtual-reality-feedback-for-patients-with-chronic-neck-pain-and-kinesiophobia
#6
Karen B Chen, Mary E Sesto, Kevin Ponto, James Leonard, Andrea Mason, Gregg Vanderheiden, Justin Williams, Robert G Radwin
This study examined how individuals with and without neck pain performed exercises under the influence of altered visual feedback in virtual reality. Chronic neck pain (n=9) and asymptomatic (n=10) individuals were recruited for this cross-sectional study. Participants performed head rotations while receiving programmatically manipulated visual feedback from a head-mounted virtual reality display. The main outcome measure was the control-display gain (ratio between actual head rotation angle and visual rotation angle displayed) recorded at the just-noticeable difference...
October 26, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27747138/immersive-molecular-visualization-with-omnidirectional-stereoscopic-ray-tracing-and-remote-rendering
#7
John E Stone, William R Sherman, Klaus Schulten
Immersive molecular visualization provides the viewer with intuitive perception of complex structures and spatial relationships that are of critical interest to structural biologists. The recent availability of commodity head mounted displays (HMDs) provides a compelling opportunity for widespread adoption of immersive visualization by molecular scientists, but HMDs pose additional challenges due to the need for low-latency, high-frame-rate rendering. State-of-the-art molecular dynamics simulations produce terabytes of data that can be impractical to transfer from remote supercomputers, necessitating routine use of remote visualization...
May 2016: IEEE International Symposium on Parallel & Distributed Processing, Workshops and Phd Forum: [proceedings]
https://www.readbyqxmd.com/read/27730391/an-html-tool-for-production-of-interactive-stereoscopic-compositions
#8
Alexey Chistyakov, Maria Teresa Soto, Enric Martí, Jordi Carrabina
The benefits of stereoscopic vision in medical applications were appreciated and have been thoroughly studied for more than a century. The usage of the stereoscopic displays has a proven positive impact on performance in various medical tasks. At the same time the market of 3D-enabled technologies is blooming. New high resolution stereo cameras, TVs, projectors, monitors, and head mounted displays become available. This equipment, completed with a corresponding application program interface (API), could be relatively easy implemented in a system...
December 2016: Journal of Medical Systems
https://www.readbyqxmd.com/read/27729595/a-review-of-wearable-technology-in-medicine
#9
Mohammed H Iqbal, Abdullatif Aydin, Oliver Brunckhorst, Prokar Dasgupta, Kamran Ahmed
With rapid advances in technology, wearable devices have evolved and been adopted for various uses, ranging from simple devices used in aiding fitness to more complex devices used in assisting surgery. Wearable technology is broadly divided into head-mounted displays and body sensors. A broad search of the current literature revealed a total of 13 different body sensors and 11 head-mounted display devices. The latter have been reported for use in surgery (n = 7), imaging (n = 3), simulation and education (n = 2) and as navigation tools (n = 1)...
October 2016: Journal of the Royal Society of Medicine
https://www.readbyqxmd.com/read/27694975/projection-type-see-through-holographic-three-dimensional-display
#10
Koki Wakunami, Po-Yuan Hsieh, Ryutaro Oi, Takanori Senoh, Hisayuki Sasaki, Yasuyuki Ichihashi, Makoto Okui, Yi-Pai Huang, Kenji Yamamoto
Owing to the limited spatio-temporal resolution of display devices, dynamic holographic three-dimensional displays suffer from a critical trade-off between the display size and the visual angle. Here we show a projection-type holographic three-dimensional display, in which a digitally designed holographic optical element and a digital holographic projection technique are combined to increase both factors at the same time. In the experiment, the enlarged holographic image, which is twice as large as the original display device, projected on the screen of the digitally designed holographic optical element was concentrated at the target observation area so as to increase the visual angle, which is six times as large as that for a general holographic display...
October 3, 2016: Nature Communications
https://www.readbyqxmd.com/read/27634561/effects-of-visual-display-on-joint-excursions-used-to-play-virtual-dodgeball
#11
James S Thomas, Christopher R France, Megan E Applegate, Samuel T Leitkam, Peter E Pidcoe, Stevan Walkowski
BACKGROUND: Virtual reality (VR) interventions hold great potential for rehabilitation as commercial systems are becoming more affordable and can be easily applied to both clinical and home settings. OBJECTIVE: In this study, we sought to determine how differences in the VR display type can influence motor behavior, cognitive load, and participant engagement. METHODS: Movement patterns of 17 healthy young adults (8 female, 9 male) were examined during games of Virtual Dodgeball presented on a three-dimensional television (3DTV) and a head-mounted display (HMD)...
September 15, 2016: JMIR Serious Games
https://www.readbyqxmd.com/read/27633216/cybersickness-without-the-wobble-experimental-results-speak-against-postural-instability-theory
#12
Mark Stephen Dennison, Michael D'Zmura
It has been suggested that postural instability is necessary for cybersickness to occur. Seated and standing subjects used a head-mounted display to view a virtual tunnel that rotated about their line of sight. We found that the offset direction of perceived vertical settings matched the direction of the tunnel's rotation, so replicating earlier findings. Increasing rotation speed caused cybersickness to increase, but had no significant impact on perceived vertical settings. Postural sway during rotation was similar to postural sway during rest...
January 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/27633192/immersion-factors-affecting-perception-and-behaviour-in-a-virtual-reality-power-wheelchair-simulator
#13
Abdulaziz Alshaer, Holger Regenbrecht, David O'Hare
Virtual Reality based driving simulators are increasingly used to train and assess users' abilities to operate vehicles in a controlled and safe way. For the development of those simulators it is important to identify and evaluate design factors affecting perception, behaviour, and driving performance. In an exemplary power wheelchair simulator setting we identified the three immersion factors display type (head-mounted display v monitor), ability to freely change the field of view (FOV), and the visualisation of the user's avatar as potentially affecting perception and behaviour...
January 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/27613125/a-randomised-study-examining-the-use-of-head-mounted-display-eyeglasses-for-teaching-surgical-skills
#14
Robert G Peden, Rachel Mercer, Andrew J Tatham
PURPOSE: To investigate whether 'surgeon's eye view' videos provided via head-mounted displays can improve skill acquisition and satisfaction in basic surgical training compared with conventional wet-lab teaching. METHODS: A prospective randomised study of 14 medical students with no prior suturing experience, randomised to 3 groups; 1) conventional teaching; 2) head-mounted display-assisted teaching and 3) head-mounted display self-learning. All were instructed in interrupted suturing followed by 15 minutes' practice...
September 6, 2016: International Journal of Surgery
https://www.readbyqxmd.com/read/27607272/development-of-an-immersive-virtual-reality-head-mounted-display-with-high-performance
#15
Yunqi Wang, Weiqi Liu, Xiangxiang Meng, Hanyi Fu, Daliang Zhang, Yusi Kang, Rui Feng, Zhonglun Wei, Xiuqing Zhu, Guohua Jiang
To resolve the contradiction between large field of view and high resolution in immersive virtual reality (VR) head-mounted displays (HMDs), an HMD monocular optical system with a large field of view and high resolution was designed. The system was fabricated by adopting aspheric technology with CNC grinding and a high-resolution LCD as the image source. With this monocular optical system, an HMD binocular optical system with a wide-range continuously adjustable interpupillary distance was achieved in the form of partially overlapping fields of view (FOV) combined with a screw adjustment mechanism...
September 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27586485/human-field-of-regard-field-of-view-and-attention-bias
#16
Woncheol Jang, Joon-Ho Shin, Mingyu Kim, Kwanguk Kenny Kim
BACKGROUND AND OBJECTIVE: Human field of regard (FOR) is an important concept that should be considered along with field of view (FOV) for people with/without handicaps, but previous studies have neglected this aspect of human perception. In the current study, we suggest and test a new virtual reality (VR) software with which to evaluate individual's detection abilities in the human FOR. METHODS: We conducted measurements of human FOV, FOR, and FOR with visual cue (FOR-cue), and we evaluated healthy adults' responses in a first experiment...
October 2016: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/27565701/cloning-of-zebrafish-mustn1-orthologs-and-their-expression-during-early-development
#17
Troy Camarata, Aleksandr Vasilyev, Michael Hadjiargyrou
Mustn1 is a small nuclear protein that is involved in the development and regeneration of the musculoskeletal system. Previous work established a role for Mustn1 in myogenic and chondrogenic differentiation. In addition, recent evidence suggests a potential role for Mustn1 in cilia function in zebrafish. A detailed study of Mustn1 expression has yet to be conducted in zebrafish. As such, we report herein the cloning of the zebrafish Mustn1 orthologs, mustn1a and mustn1b, and their expression during zebrafish embryonic and larval development...
November 15, 2016: Gene
https://www.readbyqxmd.com/read/27564382/visual-field-testing-with-head-mounted-perimeter-imo
#18
Chota Matsumoto, Sayaka Yamao, Hiroki Nomoto, Sonoko Takada, Sachiko Okuyama, Shinji Kimura, Kenzo Yamanaka, Makoto Aihara, Yoshikazu Shimomura
PURPOSE: We developed a new portable head-mounted perimeter, "imo", which performs visual field (VF) testing under flexible conditions without a dark room. Besides the monocular eye test, imo can present a test target randomly to either eye without occlusion (a binocular random single eye test). The performance of imo was evaluated. METHODS: Using full HD transmissive LCD and high intensity LED backlights, imo can display a test target under the same test conditions as the Humphrey Field Analyzer (HFA)...
2016: PloS One
https://www.readbyqxmd.com/read/27557230/compact-three-dimensional-head-mounted-display-system-with-savart-plate
#19
Chang-Kun Lee, Seokil Moon, Seungjae Lee, Dongheon Yoo, Jong-Young Hong, Byoungho Lee
We propose three-dimensional (3D) head-mounted display (HMD) providing multi-focal and wearable functions by using polarization-dependent optical path switching in Savart plate. The multi-focal function is implemented as micro display with high pixel density of 1666 pixels per inches is optically duplicated in longitudinal direction according to the polarization state. The combination of micro display, fast switching polarization rotator and Savart plate retains small form factor suitable for wearable function...
August 22, 2016: Optics Express
https://www.readbyqxmd.com/read/27552761/amplified-head-rotation-in-virtual-reality-and-the-effects-on-3d-search-training-transfer-and-spatial-orientation
#20
Eric D Ragan, Siroberto Scerbo, Felipe Bacim, Doug A Bowman
Many types of virtual reality (VR) systems allow users to use natural, physical head movements to view a 3D environment. In some situations, such as when using systems that lack a fully surrounding display or when opting for convenient low-effort interaction, view control can be enabled through a combination of physical and virtual turns to view the environment, but the reduced realism could potentially interfere with the ability to maintain spatial orientation. One solution to this problem is to amplify head rotations such that smaller physical turns are mapped to larger virtual turns, allowing trainees to view the entire surrounding environment with small head movements...
August 19, 2016: IEEE Transactions on Visualization and Computer Graphics
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