How Auto-Dimming Mirrors Protect Your Eyes at Night

Nowadays, rear-view mirrors that boast manual adjustment tabs are virtually impossible to find on new vehicles. Instead, you'll find that a standard rear-view mirror automatically dims based on how much light is directed at it. These auto-dimming mirrors rely on a healthy dose of circuitry to function.

An auto-dimming or electrochromic mirror uses photodetectors to sense light from another vehicle's high beams. That light produces an electric current that's fed to an integrated microprocessor. The microprocessor changes the reflective properties of the mirror, thereby reducing the amount of light that reaches a driver's eyes.

While an auto-dimming mirror will likely last for decades, they can fail for a variety of reasons. The most common reason for sub-par auto-dimming mirror performance is a short in the wiring that powers the assembly. If a unit is defective, replacing the hardware is easy and relatively inexpensive.



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