Glare is difficulty of seeing in the presence of bright light such as direct or reflected sunlight or artificial light such as car headlamps at night. Because of this, some cars include mirrors with automatic anti-glare functions and in buildings, blinds or louvers are often used to protect occupants. Glare is caused by a significant ratio of luminance between the task and the glare source. Factors such as the angle between the task and the glare source and eye adaptation have significant impacts on the experience of glare.
Glare from a camera flash during a Sumo fight
Example of a situation where glare can be problematic, if, for instance, the ability to determine the distance and speed of passing cars is reduced
A headlamp is a lamp attached to the front of a vehicle to illuminate the road ahead. Headlamps are also often called headlights, but in the most precise usage, headlamp is the term for the device itself and headlight is the term for the beam of light produced and distributed by the device.
A motor scooter's front with an impractical number and variety of headlamps, added for decorative purposes and characteristic of Mod culture
Ford Model T with acetylene gas headlamps
One of the first optical headlamp lenses, the Corning Conaphore. Selective yellow "Noviol" glass version shown.
1929 Cord L-29 with Woodlite headlamps U.S. patent 1,679,108
