This national public education campaign is designed to increase awareness among parents of children ages 8 to 12 about the causes and prevention of noise-induced hearing loss.
Our eyes are what allow us to see. Our eyes are designed to detect a small portion of the electromagnetic spectrum. This part of the spectrum is called the visible light region. The visible light region ranges in wavelengths from about 380 or 400 nm to 700 or 780 nm depending on which source is used. In fact it also depends on the sensitivity of a specific persons eyes.
Electromagnetic radiation (ER) in this range of wavelengths is called visible light or just simply light. Human eyes can see wavelengths from about 390 to 750 nanometers (billionths of a meter, abbreviated nm). 1 nm = 40 billionths of 1 inch, a very tiny unit of length.