A(n) is an illness or disorder of the body. it's for eyes i guess? ?

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This is first hand knowledge, top-level athletes, successful business people and achievers in all fields all  set goals. setting  goals  gives you long-term vision and short-term motivation . it focuses your acquisition of knowledge, and you to organize your time and your resources so that you can make the very most of your life.

It depends on the perspective you view of it