High-resolution Head-mounted Display Research Articles

A Wide-Viewing and High-Resolution Head-Mounted Display Using Multiple Display Panels

A Wide-Viewing and High-Resolution Head-Mounted Display Using Multiple Display Panels

Endoscopic Submucosal Dissection Using Head-mounted Display

© 2015 by the AGA Institute 0016-5085/$36.00 http://dx.doi.org/10.1053/j.gastro.2015.04.056 Eendoscopic technique for en bloc resection of mucosal cancers in the esophagus, stomach, and colon. During the procedure, the ESD operator must concentrate on the endoscopy monitor to avoid complications and to complete the treatment. However, in some situations, it becomes difficult to operate the endoscope during ESD, and the operator may be forced to view the monitor from a difficult posture. When performing ESD, the operator must also monitor the patient’s vital signs carefully. This sometimes requires the operator to turn his or her eyes from the endoscopy monitor to the vital signs monitor. At such times, the operator’s concentration on the endoscopy monitor can be disturbed during ESD. A head-mounted display (HMD) augments the visual world and aids in visual task completion. Some clinical studies have reported that an HMD is useful in laparoscopic surgery. The HMD provides freedom from gazing at a stationary monitor, which improves the surgeon’s ergonomic position. A high-resolution HMD in laparoscopic surgery can offer significantly better image quality and allow faster task performance than an overhead display. We have performed ESD using a high-resolution HMD, which allows us to focus on the endoscopy monitor more easily, and we have evaluated the efficacy of using the HMD in ESD.

Usefulness of Computerized Objective Visual Acuity Test System Using Suppression Method

Purpose: The objective visual acuity test is mandatory in certain cases, such as infants, nonverbal subjects, and subjects who need legal assistance. We designed an objective system for visual acuity test (SOVAT) consisting of three components: stimuli applied via a suppression method, display and evaluation and made a suppression method as stimuli component for SOVAT. Usefulness of the SOVAT was evaluated. Methods: The visual stimuli were presented on a high-resolution head-mounted display (HMD). An eye movement tracking program and gaze monitoring device allowed us to monitor the patient's fixation status during the test. The suppression method, in addition to a conventional induction method, was developed to use with the SOVAT and its accuracy and confidence level were evaluated. Results: On the basis of clinical data, we present the reference values for the SOVAT as below. For the induction method, objective visual acuity (smallest pixel size), the presumed subjective visual acuity was 3: 0.35-0.6, 7: 0.05-0.25, 12: below 0.05 and for the suppression method it was 1: 0.6-1.0, 1.5: 0.4-0.7, 3: 0.15-0.4, 5: 0.1-0.2. Conclusions: SOVAT using this suppression method to assess objective visual acuity proved to be more useful than that with a conventional induction method, especially in the range of high visual acuity.

High-resolution inset head-mounted display

A novel approach to inset superimposition in a high-resolution head-mounted display (HMD) is presented. The approach is innovative in its use of optoelectronic, nonmechanical devices in place of scanning mechanical devices commonly adopted previously. A paraxial layout of the overall HMD system is presented, and the benefit of employing hybrid refractive-diffractive optics for the optical component that generates the inset is discussed. A potential overall HMD design is finally presented to show the integrated system. The practical limitations of the designed system are discussed and an alternative approach is presented to compare the advantages and the limitations of these systems.