What it is
A lightweight frame holding prescription lenses that clips inside display glasses or headsets.
How it works
The insert sits between the eye and the device optics so the virtual image and the real world are both corrected.
Why it matters
Inserts are the fastest way for a device that cannot host a full prescription lens to support glasses wearers.
Advantages
- Wide prescription range
- Device can stay optically simple
- Replaceable as prescriptions change
Current limitations
- Added weight
- Extra reflections
- Progressive designs are often unsupported
Commercial readiness
Widely available for display glasses and headsets.
Development timeline
2022
Insert programmes become standard for consumer viewers