I read your post twice and still have some trouble understanding what
you are trying to say. For ordinary glass and typical plastic, about 4%
of incident light is reflected and lost from each surface or 8% from the
front and  back of the lens combined. That is not really very much. The
problem often created is that the reflections cause unwanted images and
confusion. In photography where there can easily be six to eight
glass-air interfaces in a lens, that can be a lot of light loss and
degradation of the image on the film or sensor. In photography, that is
called flare. Certainly a bright light behind you can reflect off of
your lens surfaces into your eye.

There are many different kinds of AR coatings. I am not very familiar
with those use on eyeglass lenses. The simplest ones will reduce
reflectivity to about 1% per surface. Many more tricks at greater
expense can be performed using multilayer AR coatings. Is it worth it? I
think that is highly subjective.

By the way, multilayer coatings can be used to color glasses,
particularly sunglasses. That usually ends up reducing transmission
through the lens be increasing reflectivity at some wavelengths.

Bill