The action menu icon which appears whenever an action is availble - for example, the action for opening a door or treating yourself - is blocking the weapong optics. When I'm in a shootout with an enemy and he hits me, the icon to heal myself appears right in the center of my optics, blocking my aim completely!

My suggestion is very simple, actually, just make that icon customizable in the "Layout" section under the "Game" menu option! Easy solution for a silly problem.. {F23164}