trustme.bro/r/…
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the claim
Photochromic sunglasses darken when exposed to ultraviolet sunlight
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

Photochromic sunglasses darken when exposed to ultraviolet sunlight by design, as photochromic molecules undergo a reversible chemical change when struck by UV radiation.

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The analysis

The claim that photochromic lenses darken in UV sunlight is a matter of everyday observation and established definition for these consumer products, making it common knowledge even though retrieved literature focuses on specialized molecular photoswitches rather than commercial eyewear.

Everything we examined (12)
We also searched for evidence AGAINST this claim, not only for it.
  1. Molecular photoswitches in aqueous environments.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Graphene: an emerging electronic material.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Photoclick Chemistry: A Bright Idea.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Photochromism from wavelength-selective colloidal phase segregation.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. Technology Roadmap of Micro/Nanorobots.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Electronic engineering of transition metal Zn-doped InGaN nanorods arrays for photoelectrochemical water splittingpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Caged-carvedilol as a new tool for visible-light photopharmacology of β-adrenoceptors in native tissues.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Smart bistable coordination complexes.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Single-Source Deposition of Mixed-Metal Oxide Films Containing Zirconium and 3d Transition Metals for (Photo)electrocatalytic Water Oxidationpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Photoswitchable Photochromic Chelating Spironaphthoxazines: Synthesis, Photophysical Properties, Quantum-Chemical Calculations, and Complexation Ability.peer-reviewedsupportsnot shown: read and graded, but this claim needs no citation to stand
  11. Can we make color switchable photovoltaic windows?peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Photoinduced movement: how photoirradiation induced the movements of matter.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked06 Aug 2026
judged → COMMON KNOWLEDGE · 006 Aug 2026
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