Auto-dimming rearview mirrors use special electrochromic technology to reduce glare from the headlights of cars behind the vehicle. The mirror is coated with a layer of transparent material that darkens when an electrical current passes through it. When the current stops, the mirror returns to its original state.
These mirrors can detect visible light and ultraviolet rays from the headlights of the vehicles behind you. When it detects a certain level of light, an electrical current is created and sent through the mirror’s coating, causing it to darken. This helps reduce glare from the headlights so that you are not blinded while driving at night. The same technology also works for ambient light inside the car, helping reduce glare from the dashboard or interior lighting.
Most models have an adjustable angle feature that allows you to tilt the mirror up or down, depending on your needs. The technology used in auto-dimming rearview mirrors has improved over the years, offering better visibility while driving at night or in other low-light conditions.