Which type of tonometer is mounted on a slit lamp?

A tonometer that is mounted on a slit lamp is typically an applanation tonometer. The applanation technique relies on flattening a small area of the cornea to measure intraocular pressure. When this device is attached to a slit lamp, it allows for a precise, direct view of the eye, helping the clinician observe the applanation process in real-time, ensuring accurate readings. This precision is crucial as it minimizes potential errors that can occur with less direct measurement techniques.

The non-contact tonometer uses a puff of air to measure intraocular pressure and does not require direct contact with the eye, making it a different type of tonometer altogether. The rebound tonometer measures the resistance of the cornea to a small, lightweight probe but is not specifically mounted on a slit lamp for direct observation during the measurement. As for the digital tonometer, although it may provide readings and data digitally, it does not necessarily imply it is designed for use with a slit lamp.

Using an applanation tonometer on a slit lamp combines the benefits of precise pressure measurement with the ability to visually assess the eye, making it a standard choice for practitioners.