Eyeglasses-free display

Abstract

Figure 1: Vision correction with computational displays. On a conventional screen, people with optical aberrations see a blurred image (center left). Current approaches to aberration-correcting display use multilayer prefiltering (center) or light field displays (center right). While the former technology enhances perceived image sharpness, contrast is severely reduced. Existing light field-based solutions offer high contrast but require a very high angular sampling density, which significantly reduces image resolution. In this paper, we explore the convergence of light field display optics and computational prefiltering (right), which achieves high image resolution and contrast simultaneously. AbstractMillions of people worldwide need glasses or contact lenses to see or read properly. We introduce a computational display technology that predistorts the presented content for an observer, so that the target image is perceived without the need for eyewear. By designing optics in concert with prefiltering algorithms, the proposed display architecture achieves significantly higher resolution and contrast than prior approaches to vision-correcting image display. We demonstrate that inexpensive light field displays driven by efficient implementations of 4D prefiltering algorithms can produce the desired vision-corrected imagery, even for higher-order aberrations that are difficult to be corrected with glasses. The proposed computational display architecture is evaluated in simulation and with a low-cost prototype device.

A systematic review: Virtual-reality-based techniques for human exercises and health improvement

“…Other methods for reducing vergence-accommodation conflict (VAC) in VR NEDs have also been suggested, including mono-vision and the use of focus-tunable lenses ( 59 ). By distorting the image displayed, Huang et al ( 60 ) showed that correction for refractive defects may be encoded into a light field display, doing away with the need for glasses. In Chakravarthula et al ( 61 ), depth perception, peripheral awareness, eye tracking, scanning, and visual processing speed are all implemented in a simulated real-space environment to maximize the effect of the training and to create a good transference potential to real-world dynamic environment scenarios ( 62 ).…”

Rendering algorithms for aberrated human vision simulation

“…Light-field displays have also been proposed as an alternative to overcome the limitations of single-image solutions, whereby a microlens array is placed on top of the display to provide a higher degree of control over the directionality of the emitted light. Vision correction can be achieved using such displays [93][94][95] by utilizing vision simulations to prefilter the displayed images.…”

Why People Should Care About Light‐Field Displays

“…Perhaps one of the most unconventional applications of light-field displays is the assessment 17 and correction 18 of visual aberrations in a human observer (see Fig. 4).…”

“…Ignoring stereo cues and motion parallax, however, allows for practical light-field displays to be built that support only focus cues. 17,18 To assess visual aberrations, a light field containing a pair of lines can be presented to an observer such that the retinal projections exactly overlap when the viewer has normal or corrected vision but appear at spatially distinct locations when that is not the case. By interactively aligning the lines, one can manually pre-distort the light field until the pre-distortions are canceled out by the refractive errors of the eye.…”