Applanation tonometry

Applanation Tonometry is a diagnostic procedure used primarily in the field of ophthalmology. It is a method used to measure the intraocular pressure (IOP) within the eye, which is crucial in diagnosing and managing glaucoma, a common eye disease that can lead to blindness if left untreated.

History

The concept of applanation tonometry was first introduced by Hans Goldmann in the 1950s. Goldmann collaborated with Theodore Schmidt to develop the Goldmann applanation tonometer, which has since become the standard instrument used in this procedure.

Procedure

During applanation tonometry, a small, flat-tipped cone is gently pressed against the cornea of the eye. The force required to flatten a certain area of the cornea corresponds to the IOP. The procedure is typically painless and is performed with the aid of a numbing eye drop.

Types of Applanation Tonometry

There are several types of applanation tonometry, including Goldmann applanation tonometry, Pneumotonometry, and Non-contact tonometry. Each type has its own advantages and disadvantages, and the choice of method depends on the patient's specific condition and the ophthalmologist's preference.

Goldmann Applanation Tonometry

Goldmann applanation tonometry is considered the gold standard for measuring IOP. It is highly accurate and reliable, but it requires direct contact with the cornea and the use of a numbing agent.

Pneumotonometry

Pneumotonometry, also known as air-puff tonometry, is a non-contact method that measures IOP by directing a quick puff of air onto the cornea. While this method is less accurate than Goldmann applanation tonometry, it is often preferred for routine screenings due to its non-invasive nature.

Non-contact Tonometry

Non-contact tonometry, also known as "air-puff" tonometry, measures IOP by directing a quick puff of air onto the cornea. This method is less accurate than Goldmann applanation tonometry, but it is often preferred for routine screenings due to its non-invasive nature.

See Also

• Ophthalmology
• Glaucoma
• Intraocular pressure
• Hans Goldmann