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Krypton is used in different forms for many applications in the medical industry. Krypton lasers are commonly employed for laser eye surgery. The laser is used to help prevent blood clotting in the eye as surgery is performed.
The meter was defined in 1960 as 1,650,763.73 wavelengths of the 605.78 nanometer spectral line from Krypton-86. This standard was replaced in 1983. Krypton is usually inert, but it can form molecules. The first krypton molecule, krypton difluoride (KrF 2), was discovered in 1963.