Google Glass vs CastAR

Google Glass integrates with Google Maps to provide directions and real-time navigation information.

Glass has multiple colors, frames, shades and earbuds available to help achieve a desired look.

Google Glass allows recording a 720p video by either holding down the button that's located on top of the heads up display or saying "Ok Glass, record a video". By default the device will record a 10 second video, but that restriction can be removed by clicking the button again while recording.

To interact with the device say "Ok, Glass" and give it instructions on what to do. Currently, it supports things like taking a picture, getting directions or calling someone, but more functionality will be available as developers start creating apps for the device.

In addition to augmented reality (overlaying digital elements over the real world) and virtual reality (fully digital experience), CastAR is introducing projection reality in a new way. Projection reality projects light onto reflective surfaces and back to a sensor. The projection actually appears to be in the real-world as that is where the light is coming from. It appears like a hologram, except its only visible to you.

The quick response time (8.3ms) and 120Hz refresh rate combined with accurate tracking (to 0.07mm) make for a much less nauseating experience than some other VR solutions. Nausea is at least in part caused by a delay between physical movement and interpreted movement (your body has calibrated itself to a very specific delay from when you move your head to when your view is different. VR has some delay, which extends this delay and confuses the brain).