Your presumption is false. Eyesight is a boon to communication, not a barrier. Attention to eyesight might distract you from another sense, but the choice is there.
How can staring at someone become a barrier to communication
TV transmission from one antenna to other antenna is a clear example of line of sight communication.
A2, As Dinglebot points out, gibberish is a common communication barrier. Misheard or misunderstood terms would be another.
Useing your diaphragm to speak
yes
it a barrier of communication
it causes diariah n its not safe even for eyes. it reduces the power sight of eye
Poodles have very good eye sight.
do high cholesterol affect your eye sight
How can staring at someone become a barrier to communication
There are many types of barriers of communication for example; language barrier, physical barrier, emotional barrier, listening barrier, cultural barrier, gender barrier etc
Poodles have very good eye sight.
The eye is the organ of sight
the comon eye sight for humans is the pupil
the eye is an organ of sight
they have VERY good eye sight
Your eye is the rear sight.