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DictionarySeeintervalEncyclopediaSeeinterval of Sturmfocal interval
fo·cal in·ter·valthe distance between the anterior and posterior focal points of the eye.focal intervalThe distance between the anterior and posterior focal points of the eyes.See also: intervalSturm, interval of The linear distance between the two focal lines of an astigmatic optical system. Syn. astigmatic interval; focal interval. See oblique astigmatism.LegalSeeInterval |