Long history, much data. Inaccuracies do exist, but adequate for tracking changes with most medical conditions. Oscillometry detects the small pressure changes in the cuff as the artery collapses and expands. Basis of modern automatic devices. Improve reliability by reducing apprehension and increasing number of measurements.
Maximum sensitivity requires minimum compliance of cuff bladder.
Only important example is tonometer for measuring intra-ocular pressure. Important for the detection of Glaucoma Three types Indentation. Applies a known force to a plunger, and measures indentation relative to a coup that rests on the eyeball Applanation. Measures force required to flatten a specified area of the cornea.