"Liquid Lenses" Capable of Switching Focal Lengths in 70 Milliseconds Have Been Created—does This Signal A Breakthrough for Zooming in XR Headsets

At the Augmented World Expo (AWE) that concluded in June, a startup named Oxford Optical Labs (OOL) garnered significant attention with its tunable liquid lens technology.

This technology is considered a key component for realizing future headsets with variable-focus capabilities and holds the promise of fully resolving the vergence-accommodation conflict—a long-standing issue plaguing the VR/AR industry.

Unveiling Cutting-Edge Tech: The "Shape-Shifting" Liquid Lens

OOL’s core technology is a focus-adjustable liquid lens system that has been under development for over two decades. Unlike traditional glass lenses, this lens consists of a flexible membrane filled with liquid. By altering the pressure applied to specific points on the lens, its optical parameters can be precisely adjusted, enabling the correction of nearsightedness, farsightedness, and even astigmatism within a single lens.

At the exhibition, the reporter experienced the lens firsthand. Its front section is soft to the touch—resembling a water-filled stress ball—yet it is reportedly highly durable; laboratory tests have shown lenses maintaining their performance for more than 15 years. Furthermore, the internal liquid is non-toxic and safe. Even more remarkable is that the lens's optical properties can be rapidly modified using an external "deformer" device.

The reporter demonstrated how the optical parameters of a lens change instantly when it is snapped onto a magnetic ring featuring a specific raised structure. This means that a single base lens can be adapted to meet various diopter requirements simply by swapping out different pressure attachments.

From Correction to Zoom: A Three-Step Strategy

OOL's ultimate vision is to create a true varifocal headset, but the company is adopting a step-by-step strategy:

Step 1: Customized eyewear service.

Adjustable lens inserts are provided for public venues such as museums and VR experience centers. Staff members simply use specialized equipment to read the user's optometry data and then adjust the pressure distribution via precision screws on the lens edges; this allows the lenses to instantly adapt to the specific user, eliminating the hassle of stocking a large inventory of spare lenses with varying prescriptions.

Step 2: Integration into Headsets

By partnering with headset manufacturers such as Meta and Pico, liquid lenses can be directly integrated into the devices, featuring a built-in, simple adjustment mechanism. In the future, users may be able to easily adjust the diopter themselves—much like setting the interpupillary distance—without the need to purchase expensive magnetic lenses.

Ultimate Goal: Achieve dynamic varifocal capability.

This aims to resolve the vergence-accommodation conflict in VR/AR, enabling users' eyes to naturally focus on virtual objects at varying distances—just as they would in the real world. This brings the varifocal vision demonstrated by the Oculus Half-Dome prototype closer to becoming a reality.

How does zoom technology work? By leveraging "visual blind spots."

Achieving dynamic zooming requires close coordination between eye-tracking technology and a rapid lens-adjustment mechanism. The system must predict the endpoint of eye movement—specifically, the object the user is about to fixate on—in real time. It then leverages the "blanking period" (typically exceeding 100 milliseconds)—during which the brain suppresses visual signals while the eye performs a saccade—to rapidly adjust the lens to the correct position within approximately 70 milliseconds. Fine-tuning follows to ensure precise focus, and the entire process must be sufficiently smooth to avoid causing user discomfort.

Hands-on Experience: Manual Zoom Prototype Successfully Validated

The reporter tested an AR prototype integrated with an optical waveguide display. In manual mode, controlled via a mini-keyboard, the lens could clearly focus on objects at near, intermediate, and far distances, maintaining the clarity of both virtual labels and their corresponding physical objects simultaneously.

This demonstrates the technical feasibility of OOL lenses for AR varifocal applications.

However, the reporter also noted that the current prototype remains very rudimentary; the zooming speed falls far short of the 70-millisecond target, and the operation is accompanied by significant mechanical noise. There is still a long way to go from a functional prototype to a mature consumer-grade product.

Outlook: Challenges and Opportunities Coexist

OOL's fluid lens technology already meets all ANSI standards, and its prospects in the field of tunable prescription lenses are highly promising—particularly for B2B applications involving frequent user turnover, where it holds great appeal.

However, the reporter remains cautiously optimistic about the realization of varifocal capabilities in consumer-grade headsets. While theoretically feasible, transforming this into a mass-produced product that is stable, reliable, silent, and cost-effective may still take several years. Furthermore, it faces competition from other technological approaches, such as electronically controlled liquid crystal lenses.

In any case, OOL’s demonstration at AWE undoubtedly points to an exciting direction for the XR industry. Hailing from Oxford, UK, this cutting-edge technology is steadily advancing toward the goal of making visual experiences in the virtual world more natural and human-centric.

Source: VRAR Planet