Optimizing the Information Transfer of Near-Eye Displays
Abstract
Introduction. A Head Mounted Display (HMD) is unlike all other displays fixed to the head, making eye movements the sole option to scan the display (since head movements have no effect on the ocular image position). While the largest saccades easily exceed 50 deg, naturally occurring saccades typically stay within 15 degrees. While attractive for many applications, a HMD may therefore form a liability: large-FoV HMDs are known to cause eye-strain and the rate of information uptake is expected to decrease towards the edges. In addition, aniseikonia (a common visual deficit) is expected to cause eye strain and limit the readability of large FoV binocular HMDs. Hence, as the FoV of a HMD increases, its screen layout needs to optimize overall display readability by preventing clutter while taking common optometric conditions into account. Methods. We measured the ability of 12 subjects to quickly determine the orientation ( vs ) of a target T surrounded by 4 randomly oriented (up, down, left, right) flanker Ts as a function of 1) target-flanker spacing or crowding (small /medium/large), 2) flanker polarity, and 3) eccentricity (15/30/45 deg). Visual comfort was assessed with questionnaires. All 12 subjects scored normal on relevant optometric tests (stereopsis, visual acuity, Awaya aniseikonia test, phoria). In some conditions, an aniseikonic lens placed in front of one eye optically enlarged the image by 2 , simulating a common optometric condition. The additional delay caused by the presence of the four flankers is adopted as the Crowding component of the reaction time. Results. Reaction time increased with crowding, symbol eccentricity, and decreased with opposite target-flanker polarity (all p values < 0.001). Contrary to our expectations, reaction time decreased after a break, suggesting saccadic motility improves over time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 03, 2019
- Accession Number
- AD1096380
Entities
People
- Alexander Toet
- Frank Kooi