Now, augmented reality device that is easier on the eyes

Researchers have developed a new goggle-like device which allows for 3D augmented reality technology that minimises visual fatigue. Augmented reality technology enables goggle-like devices — akin to Google Glass — that you wear on your head to superimpose computer-generated images onto your direct view of the physical world.

A major limitation of this kind of augmented reality (AR) technology is that moving back and forth between a 2D image on the screen and a 3D world in front of you causes eye strain, unless you’re looking at something far away.

Now, a new device developed by researchers at the University of Arizona in Tucson and the University of Connecticut in Storrs is making AR technology easier on the eyes for short-distance applications, too, by superimposing 3D images instead of 2D.

“Minimising visual discomfort involved in wearing AR displays remains an unresolved challenge. This work is making a significant step forward in addressing this important issue,” said first author Hong Hua of the University of Arizona.

“A lightweight, compact and high-performance Google Glass-like device — called an optical see-through head-mounted display (OST-HMD) — could potentially be a transformative technology to redefine the way we perceive and interact with digital information,” Ms. Hua said.

For example, it could one day allow a doctor to see computed tomography (CT) images overlaid on a patient’s abdomen during surgery or provide a new way to train soldiers by incorporating 3-D virtual objects into real-life environments.

AR goggles for long-distance viewing don’t always cause eye strain; some of these eye-friendly designs are actively used for military applications. But short-distance designs — in which you would focus simultaneously on a 2D screen and a 3D world immediately around you — do cause visual discomfort, due to the so called accommodation-convergence mismatch problem.

The device developed by Ms. Hua and her colleague Bahram Javidi of the University of Connecticut solves this problem for OST—HMDs by superimposing a 3D image, rather than the standard 2D image, onto the 3D view of the real world.

To create the 3D image, the researchers developed a technology called microscopic integral imaging display. In this technique, a tiny, high-resolution screen produces views from different perspectives of the 3D image you want to superimpose.

The views then combine to reconstruct a 3D scene that’s sent through a specially shaped optical lens — called a freeform eyepiece — and into the eye. The lens, based on an emerging technology known as freeform optics, also allows you to directly see the real-life scene before you. There’s no conflict in how your eyes focus, giving you a much more comfortable version of augmented reality, Ms. Hua said.

The research is published in The Optical Society’s (OSA) open-access journal Optics Express.

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Printable version | Jan 16, 2021 3:50:44 AM |

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