Our view of self and world depends on the clarity of our vision and focus.
We can view ourselves to be bigger or smaller than what we actually are .. respectively making us look either too vain or lacking in personality to others.
Friends, family, teachers, mentors or other influences in our lives act as corrective glasses to compensate/fix the defects in our vision (myopia, presbyopia, astigmatism, hyperopia etc.)
The worst things we can do to ourselves in a to wear a wrong set of glasses .. to listen to people which falsify our vision rather than correct it. People who cloud our sights, color our vision or make us lose focus or see stuff which is not the way it is.