Encountering Problems with Near Vision after 40. If you have never needed eyeglasses or contact lenses to correct distance vision, then experiencing near vision problems after age 40 can be concerning and frustrating. You may feel like you've abruptly lost the ability to read the newspaper or see the cell phone numbers.
A system of symbols used to represent special things. Example: In mathematical notation â means infinity.
A mathematical notation is a writing system used for recording concepts in mathematics. 1  The notation uses symbols or symbolic expressions which are intended to have a precise semantic meaning.  In the history of mathematics, these symbols have denoted numbers, shapes, patterns, and change.