Is there any point due to light pollution where averted vision becomes ineffective?

[realflow100]

Is there any point due to light pollution where averted vision becomes ineffective?
Even when I know what and where to look for something for example a faint star
I see almost no difference with averted vs direct vision. even on a perfectly clear moonless night (I'm wearing glasses now so I should technically have 20/20 vision or very close to 20/20 vision)
when looking at the faintest stars I can see
Most of those stars are around magnitude 4 to 4.5 are the faintest ones i can see. I'm almost certain i'm in at least bortle 8 to 9
as soon as im able to see it I can lock my eyes onto it and see it almost just as well with direct vision.
The most gain in averted vision is possibly 0.1 to 0.2 magnitude difference in the faintest thing i can see.
The only time ive noticed any increase in difference is when using a telescope and looking at faint fuzzys like orion nebula. or one of the nebulas near the core of the milkyway. like lagoon nebula. or m22 but theres still only a tiny difference. nothing more than a percent or 2 more than what i can see with direct vision

I also don't see any gains in dark adaptation after about 5 minutes even with the best observing location I can get.
upstairs 2nd bedroom with the window open and crouched down low or sitting down. lining the window frame with black trash bags and black electrical tape to remove any glare or glow from streetlights outside. and prevent them from reflecting off the white window frame interior.
Standing outside anywhere in a mile radius is worse because i have nothing to block off the glare in multiple directions at once.
I can very clearly see the color of the sky at night on a perfectly clear moonless night. it matches what a long exposure photo looks like. a brown orange-red-yellow color which looks really ugly.
The sky near where the full moon is is a more blue-white color. so I can see a noticable difference.

Also if I track a magnitude 1 or 2 star as morning is coming It never completely disappears just becomes harder and harder to find and lock my eyes onto it to see it.
If I keep my eyes locked focused on it I can still see it for a long time as the sun gets closer and closer to the horizon. only becoming unable to see if I lose track of the star unable to lock my eyes onto it after a certain point. it just looks smaller and smaller instead of fainter. like it looks like a smaller point thats harder to spot. instead of just disappearing after a certain point.
after enough time i just cant find it anymore. its like its just too small to see. rather than too faint?
with binoculars I can still see the star even when the sun is about 5 degrees below the horizon! On the same side of the sky where the sun is rising from as well.

[Ruud]

Averted vision works better for nebulae and other faint fuzzies than for stars.

I think this is because off-axis, they eye really doesn't focus very well at all. Fuzzies are spread out to begin with, so a bit of blur doesn't make much difference. This is why they can benefit from the higher sensitivity of the rods in the retina.

Stars really benefit from from being properly focused, when all their light is concentrated on a single receptor (or a very small group of them), thus having more change to trigger a nerve impulse.

Just guessing of course.

[John Fitzgerald]

I find, the brighter the sky background, the less effective averted vision becomes. I have used av to detect fairly wide, faint companions of not so bright double stars. It won't work much to detect faint companions of bright stars.

[realflow100]

Not doing any double star stuff. can barely see normal stars as it is.

[Bigzmey]

For averted vision to be effective your eyes need to be dark adapted. If your sky is bright and there are other sources of light around your eyes can't gain dark adaptation and the effect of averted vision is limited.

However, if you block the stray light at the EP (placing towel or hood over your head while observing) you could still use averted vision at the EP.