"Darting" means moving rapidly from one place to another. If your eyes "dart," then your gaze is rapidly shifting from one point to the other.
I've never heard that expression used idiomatically, but if it is, it is obviously referring to paying too much attention to what's behind you (including past experiences) when you should be giving your full attention to what's in front of you. It doesn't seem to be an idiom. I think it's just a figure of speech to make the writing more dramatic -- the person's eyes are "darting," meaning they move rapidly back and forth from the road in front to the rear-view mirror of the car, or to the rear-view behind them.
It is caused when one has a epileptic attack , a serious case.
Black ice on road surface , cross-traffic running red lights, objects falling from other vehicles and into your path, animals or children darting into your lane of traffic.
Darting
Road to Joy - Bright Eyes song - was created in 2005.
vocabulary of the road
Free on Road!
Eyes Beauty (Gold of Eyes)
Bringing up bile and darting eyes could be signs of various issues such as gastrointestinal upset, poisoning, or neurological problems. It is important to take your dog to the vet promptly for a thorough examination and appropriate treatment.
vocabulary of the road
run