Strehl ratio
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The Strehl ratio is a measure of the quality of optical image formation, originally proposed by Karl Strehl, after whom the term is named.[1][2] Used variously in situations where optical resolution is compromised due to lens aberrations or due to imaging through the turbulent atmosphere, the Strehl ratio has a value between 0 and 1, with a hypothetical, perfectly unaberrated optical system having a Strehl ratio of 1.