According to a recent issue of CHANGING TIMES magazine, a new rearview mirror available as an option on about 20 different 1990 model cars just about eliminates nighttime glare from the headlights of cars that are following you.
The mirror, which is electrochromic, costs about $100 and so far is only available on luxury cars made by GM, Ford, Chrysler and a few foreign manufacturers.When the mirror detects a headlight, it darkens to the level required to eliminate the glare. When the glare is gone it returns to its normal state. The mirrors are particularly helpful to older drivers because after about age 40 sensitivity to glare begins to increase.
Gentex Corp. makes the mirrors.