Meta reveals the future of mixed reality

Meta reveals the future of mixed reality

Published: 16-07-2022
Updated: 30-01-2023

Meta (former Facebook) has revealed what they have been tinkering with for the future of mixed reality. What is revealed is the mind-boggling conceptual headset: Mirror Lake. The headset will combine optics from virtual and augmented reality achieving a completely new type of mixed reality experience, and offer a unique reverse video passthrough solution.

We will uncover:

  • What is Mirror Lake?
  • What is the Holocake 2 lens?
  • How does the Mirror Lake eye tracking work?
  • What is the reverse video passthrough technology
  • Conclusion

What is Mirror Lake?

The virtual and augmented reality roadmap for Meta is extensive with its technological R&D funneling into futuristic mixed reality headsets. One of them being Mirror Lake.

But to understand Mirror Lake, we need to cover the release pipeline for Meta.

VR Expert - Meta headsets

Meta’s 4 new virtual and mixed reality headsets by 2024

The four unreleased headsets are categorized into two headsets for gamers, and two headsets for enterprises. The two headsets for gamers are codenamed, Project Stinson and Project Cardiff, capitalizing on the success of the Oculus/Meta Quest 2. The two headsets for enterprises and prosumers are codenamed, Project Funston and Project Cambria. The latter, Cambria, a mixed reality headset we have covered in-depth previously, should be released later this year. Funston is planned to release in 2024 and is said to be an iterative headset after Project Cambria.

Meta’s 2 new augmented reality glasses by 2024

Meta is planning its foray into augmented reality by 2028. The first AR glass will be Project Hypernova, projected to release in 2024. Similar to the AR glasses from Magic Leap, Hypernova will externalize its processing to a separate device connected to the glasses.

Next is Project Nazare, acting as multiple AR glasses which are lighter and more advanced, offering complete augmented reality experiences.

The culmination of everything into Mirror Lake

The upcoming headsets show the commitment Meta has to virtual and augmented reality and the deep research inside Reality Labs. As Mark Zuckerberg says, “We’re not just refining the types of screens that we’ve had on phones or TVs or computer monitors for decades and that already exist. We have to explore new ground in how physical systems can work together and how our visual system perceives the world.”

Mirror Lake is an R&D conceptual headset, mixing Meta innovations developed in the last seven years. It is a small, lightweight, and energy-efficient device with impressive futuristic technologies.

VR Expert - Meta Mirror Lake Concept

What is the Holocake 2 lens?

Meta’s Holocake 2 (the title picture above) is a research prototype combining the Pancake lens from virtual reality with the holographic waveguide in augmented reality. The result is a thin and light form factor, offering unparalleled mixed reality functionalities by using the Meta display technology called Half-Dome 3. A screen solution using liquid crystal lenses to dynamically change focus based on where the wearer looks.

Mirror Lake will have a display experience designed in layers that Meta calls the “Sandwich Principle”. This principle works by layering multiple screen technologies that interact to create a new mixed reality experience.

However, existing backlighting used in display engines does not function with this Sandwich Principle. Instead, lasers must be used to alight the display, which is not sufficient and mass producible. “We’ll need to do a lot of engineering to achieve a consumer viable laser that meets our specs — that’s safe, low-cost, and efficient and that can fit in a slim VR headset. As of today, the jury is still out on finding a suitable laser source” as Chief Researcher Abrash says during the Mirror Lake presentation.

VR Expert - Meta Mirror Lake Passthrough

Mirror Lake will have improved eye tracking

Mirror Lake will also have a different take on eye tracking. Holographic foils will send the light differences from the wearer’s eyes into cameras located on the side of the headset. So rather than a set of cameras tracking the pupils of a person’s eyes; Mirror Lake tracks the changes of the eyes proper and beams them into cameras hidden away. This slims the headset and improves eye tracking for improved foveated rendering and video passthrough.

VR Expert - Meta Passthrough Development

The novel reverse video passthrough

Reverse video passthrough is when someone outside the headset can see a realistic representation of the headset wearer’s eyes. And for mixed reality, reverse video passthrough is pivotal. Mirror Lake will use artificial intelligence to achieve this in what Meta calls “Neural Passthrough”. This works by using AI to correct the positions of the wearer’s eyes and display them on the outside of the Mirror Lake headset.


The R&D conceptual headset Mirror Lake is a culmination of everything Meta has learned in the last seven years about virtual and augmented reality. The headset shows the future of mixed reality from an impressive new optics technology combining the Pancake lens from virtual reality and holographic waveguide from augmented reality. Further enabling AI reverse video passthrough and improved eye tracking. This is just a taste of what Meta has in store for the future of mixed reality as they are set to reveal more insights into their research later this year. Exciting times ahead!