Air puff tonometry measures intraocular pressure without patient contact but can yield false readings if the patient blinks or squeezes.

“that's just an intraocular that's a way of measuring the intraocular pressure that we don't use but it has the advantage of not requiring the patient to be touched with anything so you can indent the cornea with a known amount of force from an air puff and look at how it optically deforms the disadvantage to the air puff and it's not really considered a i don't think a gold standard of measuring pressure is that if you blink really quickly and squeeze then you can have a false reading with that type of air puff tonometry”