A non-contact tonometer is a medical device used to measure intraocular pressure (IOP) in the eyes without touching the surface. It uses a puff of air to flatten the cornea, allowing the device to calculate the pressure inside the eye. This method is quick and generally comfortable for patients, making it a popular choice in eye examinations. These tonometers are often used in routine eye check-ups to screen for conditions like glaucoma, which can lead to vision loss if not detected early. Non-contact tonometry is beneficial because it reduces the risk of infection and discomfort associated with traditional contact methods.