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.
Scientific notation is a way of writing numbers that are too big or  too small to be conveniently written in decimal form.   In normalized scientific notation all numbersâ¦ are written in the  form a x 10^b (a times ten raised to the power of b) where a is a  nonzero single-digit integer and b is an integer.