The promising technology of stereoscopic displays is interesting to explore because 3D virtual applications are widely known. Thus, this study investigated the effect of parallax on eye fixation in stereoscopic displays. The experiment was conducted in three different levels of parallax, in which virtual balls were projected at the screen, at 20 cm and 50 cm in front the screen. The two important findings of this study are that parallax has significant effects on fixation duration, time to first fixation, number of fixations, and accuracy. The participant had more accurate fixations, fewer fixations, shorter fixation durations, and shorter times to first fixation when the virtual ball was projected at the screen than when it was projected at the other two levels of parallax.
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http://dx.doi.org/10.1016/j.apergo.2017.12.020 | DOI Listing |
Neurosurg Focus
December 2024
1Department of Biomedical Sciences, Humanitas University; and.
Objective: Microvascular decompression (MVD) in trigeminal neuralgia (TN) is currently managed using an operating microscope (OM). Recent experiences with endoscopy-assisted, fully endoscopic, and exoscopic surgery have been described, aiming to improve ergonomics and image quality. The aim of this study was to report the first series of patients operated on with the aid of a robotic binocular exoscope using a head-mounted display (RoboticScope).
View Article and Find Full Text PDFMetasurfaces are extensively utilized in nanoprinting and hologram fusion displays due to their superior wavefront shaping capabilities. However, the creation of continuously varying grayscale images based on conventional Malus's law necessitates the use of at least one polarizer for observation, which compromises the metasurface's integration. In this study, inspired by the Jacobi-Anger expansion, we propose a tri-channel metasurface to establish three independent information channels for simultaneous grayscale nanoprinting and polarization multiplexed holography.
View Article and Find Full Text PDFSci Rep
November 2024
Department of Ophthalmology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen- Nürnberg, Erlangen, Germany.
Following the Coronavirus disease 2019 (COVID-19) pandemic, a large number of people continue to report Post-COVID symptoms (PCS). A wide variety of symptoms are described, including fatigue, post-exertional malaise and cognitive impairment. However, adequate objective diagnostic tests for PCS are not yet available.
View Article and Find Full Text PDFJ Exp Child Psychol
January 2025
Institute of Experimental Psychology, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany.
In monocular gap stereopsis, one eye perceives a complete rectangular surface while the other eye perceives two small adjacent rectangular surfaces separated by a narrow vertical gap. Our visual system interprets the difference caused by the unmatched monocular images as a depth difference between two small rectangles. In a spontaneous visual preference study, it was asked whether participants aged 4 months responded to the depth effect generated by a monocular gap.
View Article and Find Full Text PDFComput Biol Med
December 2024
Incubator for Medical Mixed Reality at Stanford (IMMERS), Department of Radiology, Stanford University, Palo Alto, CA, USA; Department of Radiology, Stanford University, Palo Alto, CA, USA.
Background And Objective: Volume-renderings of computed tomography or magnetic resonance angiograms (MRAs) are routinely used by surgeons in the preoperative assessment of vascular anatomy in kidney donors. Stereoscopic headsets (OST-HMD) like Microsoft HoloLens allow intuitive interaction with three-dimensional content for more intuitive comprehension, but do not allow real-time ray-casting volume-rendering of medical volume datasets on-device due to computational limitations.
Methods: We introduce NEsted Semi-Transparent Isosurface Simulated Volume-Rendering (NESTIS-VR), as an on-device alternative to ray-casting volume-rendering and developed an application for HoloLens to render kidney donor MRAs with interactive control of fundamental rendering parameters.
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