Circles and lines seen when squinting at light are caused by optical phenomena in the eye

the verdict

COMMON KNOWLEDGE

Legacy classification; evidence review pending

Recorded sources

no sources on either side

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that circles and lines seen when squinting at light are caused by optical phenomena in the eye?

The visual phenomenon of seeing circles, diffraction lines, or light patterns when squinting at a bright light source is a well-known consequence of light interacting with the tear film, eyelashes, and eyelids of the human eye, and requires no citation.

Verdict: COMMON KNOWLEDGE · 0 sources for, 0 against · Last checked 5 Aug 2026

The analysis

The claim describes a familiar, everyday physiological optical observation regarding how the eye's structures and tear film diffract light when squinting. Under the instructions, trivially true observations of everyday optics are classified as common knowledge, requiring no formal citations from the retrieved literature.

What does the evidence say?

Receipt History

first checked05 Aug 2026

judged → COMMON KNOWLEDGE · 9505 Aug 2026

Anyone with this link can read the claim and its public receipt, including any personal information in that text. Open permanent receipt.

Check your own claim

Challenge the receipt

I have a source that contradicts this verdict I have a source that supports it No source: request a receipt review Requests are recorded for review. This does not start an automatic check or guarantee a response time.

Citation formatting by citeproc-js (Frank Bennett) and the Citation Style Language project. Source and licenses.

This receipt is an automated verdict against our published method · not an opinion about any author or publication.
Terms · Privacy · How verdicts work