What type of test is done to assess the pressure inside the eye?

Tonometry is the test specifically designed to measure the intraocular pressure, or pressure inside the eye. This is a crucial aspect of eye examinations, particularly in the context of diagnosing and monitoring conditions like glaucoma, which can lead to vision loss if not properly managed.

During tonometry, a device either touches the eye's surface or uses a puff of air to assess pressure. The results help eye care professionals determine whether the intraocular pressure is within a normal range or if it might indicate potential issues that require further investigation or treatment.

The other tests listed serve different purposes: a refraction test checks for vision clarity and refractive errors, perimetry evaluates the field of vision, and a slit lamp examination provides a detailed view of the structures within the eye. Each test plays an essential role in comprehensive eye care, but tonometry is the one specifically focused on measuring eye pressure.