Using Blind Spot Mirrors to See What Your Mirrors Miss
Last reviewed: 2026 · Driviology Road Safety Education Team
Quick Answer
A blind spot mirror is a small convex mirror added to the corner of your side mirror to widen your field of view into the area a standard mirror misses, but it should supplement, not replace, a shoulder check.
Even a well-adjusted side mirror leaves an area next to your vehicle unseen. A small add-on convex mirror can shrink that gap considerably.
How Blind Spot Mirrors Work
The curved surface of a convex mirror shows a wider field of view than a flat mirror, at the cost of making objects look smaller and farther away than they are. Placed in the corner of your existing side mirror, it reveals a slice of your blind spot that would otherwise go unseen.
Installing and Adjusting Them
Stick-on blind spot mirrors are inexpensive and simple to install in the outer corner of each side mirror. Adjust them so they show the area just outside what your main mirror already covers, rather than duplicating the same view.
They Do Not Replace a Shoulder Check
Because convex mirrors distort distance, always confirm with a quick shoulder check before changing lanes, even with blind spot mirrors installed.