When doing an evasive roll (Q or E by default), your point of view will roll along, making it hard to see what is going on. However if you zoom your view and do a roll, your point of view will remain steady while rolling.
Zooming with a telescopic sight will have your POV roll along
I have attached a picture mid-roll, where you can see my gun rolling while my point of view is steady {F19606}
Go prone
Roll left and observe how POV rolls along
Zoom in and roll left again, and observe how POV remains steady
You wouldn't do this in Real-life. Rolling around with your eye to your scope whilst you roll around, it's a good way of gouging your eye out.
Either way it needs to be consistent. Rolling away I'm happy with, but doing it zoomed and shooting as you roll is crazy.
Look at the screenshot :)
I was using the default weapon for a BLUFOR rifleman with the reflector sight, but it seems to happen with all primary weapons, ie. not pistols