With 15th century technology, it was easier to make a regular curved mirror (from blown glass) than a perfectly flat one.
Round convex mirrors called Oeil de Sorcière (French for "sorcerer's eye") were a popular luxury item from the 15th century onwards, shown in many depictions of interiors from that time. Similar devices are sold to be attached to ordinary computer monitors.Ĭonvex mirrors make everything seem smaller but cover a larger area of surveillance. Ĭonvex mirrors are used in some automated teller machines as a simple and handy security feature, allowing the users to see what is happening behind them. They are also used on roads, driveways, and alleys to provide safety for motorists where there is a lack of visibility, especially at curves and turns. They are useful for people to look at any obstruction they will face on the next hallway or after the next turn. They are usually mounted on a wall or ceiling where hallways intersect each other, or where they make sharp turns. These mirrors are often found in the hallways of various buildings (commonly known as "hallway safety mirrors"), including hospitals, hotels, schools, stores, and apartment buildings.
Convex mirrors are preferred in vehicles because they give an upright (not inverted), though diminished (smaller), image and because they provide a wider field of view as they are curved outwards.
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In some countries, these are labeled with the safety warning " Objects in mirror are closer than they appear", to warn the driver of the convex mirror's distorting effects on distance perception. The passenger-side mirror on a car is typically a convex mirror. Detail of the convex mirror in the Arnolfini Portrait
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