I thought of that too. The mirror plane becomes triangular & on one the sides, it has a flatten side that is towards the driver's line of sight. It would have better optic properties but a larger tapered tail shape. Different vehicles have so many different tumblehome angles. The singular study was just see the inherent problem of glare at different shapes & angles.
People have mentioned many times about cleaning & adding a boatail to OEM side mirrors or making an optimal mirror shape replacement.
I studied it w/ simple models & viewed the inevitable sun reflections that could hamper vision. The other concerns are snow/dirt buildup, internal/exterior fogging, material hazing, inherent design clearances. This could be aftermarket addition or OEM replacement.
Any thoughts & other concerns?
All of those designs would distort the light coming into the mirror from behind, so it won't matter that they are open toward the driver
I've been running The Clunker for a week with the passenger mirror folded. The view out the right side is great in that car, so I don't even miss it. I plan to delete that mirror and put in the interior mirror just to cover my bases. I also removed the passenger headrest when nobody is in the car, as it makes the view even better.