Delboeuf Illusion. The inner circle appears smaller when surrounded by a large circle than when surrounded by a small circle. Source: Drawing by Berit Brogaard When dentists drill holes in your teeth, ...

Dentists drill bigger holes in teeth than necessary for restorations because of an optical illusion that makes circular objects look smaller than they really are, according to a new study in PLOS One ...

There’s an optical illusion where a small, enclosed area appears larger when surrounded by a larger area. This visual anomaly, called the Delboef illusion, is making the holes that dentists cut in ...