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Do you mean for eyesight?
20-20 vision is average vision of human what he can see normally from 20 feet away as a standard.
If 20-40 vision, that means you have to stand 20 feet away from an object that the average person can distinguish from 40 feet away.
If 20-15, that means you can stand 20 feet away from an object that the average person can distinguish from 15 feet away.
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What does 30 20 class of concrete represent?
Digit 30 stands for minimum strength required after 28 days and 20 stands for maximum size of aggregate
What does the little 4 stand for in math?
The answer depends on where exactly it stands!The answer depends on where exactly it stands!The answer depends on where exactly it stands!The answer depends on where exactly it stands!
What does f9 stands for?
F9 stands for "fine"
What is a VOM meter?
It is a multi-range multi-meter. V stands for Volts. O stands for Ohms. M stands for milliamps.
What does k g d m d c m stand for?
K stands for 'Kilo', which means 1,000.G stands for 'Giga', which means 1,000,000,000.D stands for 'Deca', which means 10.d stands for 'deci', which means 1/10th.M stands for 'Mega', which means 1,000,000.m after a number, stands for 'meter' (a unit of measure)m before a number, stands for 'milli', which means 1/1000th.C stands for 'Centa', which means 100.c before a number,stands for 'centi', which means 1/100th.c after a number usually represents the constant of the speed of light.
