Science radio show Quirks and Quarks had a fascinating segment on its most recent programme asking whether squinting really does help you see more clearly. It turns out, it does.
The programme talks to ophthalmologist Stephanie Baxter from Queen’s University in Kingston who notes that squinting focuses the incoming light onto the fovea – a central point on the retina responsible for sharp central vision – and cuts out light from other directions.
The short segment on squinting is at the bottom of the page.
Link to December 5th edition of Quirks and Quarks.