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Changes from the 1994 AECC definition. the term acute lung injury was abandoned. measurement of the PaO2/FIO2 ratio was changed to require a specific minimum amount of PEEP. 3 categories of ARDS were proposed (mild, moderate, and severe) based on the PaO2/FIO2 ratio. Radiographic criteria were changed to improve interrater reliability.
AC/A ratio, (in ophthalmology) the proportion between accommodative convergence (AC) and accommodation (A), or the amount of convergence automatically resulting from the dioptric focusing of the eyes at a specified distance.