I am not sure as a percentage but <span>One in five people aged 75 and over are living with sight loss. </span>
Many factors can influence how a person feels about her/his self. These factors can depend on environment, previous past experiences, and mental health. Childhood also have a major impact. But, to have a more positive self concept, it takes time. One of the first things needed to do is to pin point the reason for the lower self concept. Sometimes that can be trigger by a comment someone made, or a bad experience that provoked emotions. But, you is how you define you. One of the top things that people who have a bad self concept/self imagine focus on, is perfection. This is the reason for most self concept issues. But, it’s important to realize that this goal, is very,very unrealistic. People also have this voice in the back of their heads that really criticize themselves and other people. It’s important to try to ignore that voice that tells you bad things about yourself. It’s important to realize your own uniqueness.
Its good to be in positive energy balance when you're in the most stressful state like during a test you didn't study. If you just think and take your time, some of the class work knowledge will come to you.
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I was not sure what you were asking, so I just completed the sentence anyway. :I