Noncontact tonometry, also known as air-puff tonometry, is a common method used to measure intraocular pressure (IOP) without physically touching the eye. It involves directing a gentle puff of air onto the cornea, which causes a slight indentation. The device then calculates the IOP based on the corneal response.

The air puff tonometer, also known as a non-contact tonometer, is a device commonly used in optometry and ophthalmology to measure intraocular pressure (IOP). Intraocular pressure refers to the fluid pressure inside the eye, and it is an important measurement in assessing the risk of glaucoma, a condition characterized by elevated IOP that can lead to optic nerve damage.

When using the air puff tonometer, the patient sits in front of the instrument, and a brief, gentle puff of air is directed at the surface of the eye.