The electromagnetic spectrum goes from gamma rays in the sub nanometer range up to radiowavelengths and beyond.  The visible spectrum that we perceive through our eyes ranges from 400nm up to 700nm so represents a tiny portion of what is around us at all times. Lasers are different from normal light in that they produce very specific frequencies or wavelengths of light corresponding to atomic transition levels of various materials. The fact that laser light has such a prescise frequency makes it even more potentially hazardous to the human eye as all the energy focusses the same way into a tiny spot on the retina rather than being spread over a larger range as with normal light or LEDs.

Filters used in laser safety glasses absorb the frequencies of light that they are designed to protect against. The image below on the left blocks out around 80% of the visible spectrum however lets through light wavelengths corresponding with the violet part of the spectrum. The image below on the right lets through blue wavelengths while blocking out the rest.

If you have any questions about laser filters or laser safety eyewear feel free to contact us at info@dioptika.com or call us on 1300 411 337 and one of our laser safety experts will be happy to help.