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.
Exponential and Scientific Notation. Exponential notation is a convenient way to express large and small numbers. Numbers can be expressed as a coefficient multiplied by a base raised to an exponent (power). A Ã B N. A = coefficient. B = base. N = exponent. The coefficient is not always written explicitly if it happens to be equal to one.