Most cars have two sun visors, one for the driver's side and a second for the passenger's side, with the rear-view mirror often mounted in between the two sun visors. Each visor can be lowered to help block light from the sun entering through the windshield. They can also be turned to the front side window to reduce lateral sun exposure.
Many sun visors also incorporate a vanity mirror for the passenger's convenience. In some cases, a flip up cover over the mirror automatically turns on the vanity lights, which can be adjusted with a sliding dimmer control (see image).
Recently, sun visors incorporating LCD screens, DVD players and other devices have become available as an aftermarket modification. They are also available as an option or standard item from manufacturers with garage door opener systems such as HomeLink built into the visors.
Exterior sun visors are available for trucks as cab visors.