A lot of new cars I've seen have partial curve to alleviate the blind spot.

But what often goes unmentioned is adjusting an older, flat mirror correctly in the first place. I used to adjust mine so that a tiny portion of my car was in the lower right hand corner of the mirror. After a few years, I realised that adjusting the mirror out, further away from the car, gave me the widest and most practical view for driving of the lane to the left of me.