Definition
Fresnel lenses are a type of collapsible lens used in VR headsets. They consist of a series of concentric rings, which allow for a thinner and lighter lens compared to a conventional convex lens of the same focal length, but they are known for a narrow ‘sweet spot’ of clear focus and potential visual artifacts.
Why it matters (in Poovi’s context)
The standard lens technology in the Quest 3S (and Quest 2), representing a significant compromise in visual quality compared to pancake lenses.
Key properties or components
- Narrow sweet spot
- Prone to blurriness outside the sweet spot
- Potential for glare and God rays
- Lower manufacturing cost
- Larger and heavier profile
Contradictions or debates
While criticized for their limitations, Fresnel lenses were instrumental in making VR more accessible due to their lower cost.