How is intraocular pressure measured?

Intraocular pressure (IOP) is typically measured using several different methods. Non-contact tonometry is a common approach that uses a puff of air to estimate IOP, offering advantages such as short testing time and reduced risk of infection. Additionally, applanation tonometry and indentation tonometry are also widely used. Applanation tonometry measures IOP by applying pressure to the cornea and detecting pulsations in the blood flow, while indentation tonometry determines IOP based on the degree to which the cornea indents inward. Before measurement, patients should place their chin on the device's chin rest and follow the doctor's instructions carefully. If any eye discomfort occurs, seek medical attention promptly.