What crucial test is often performed to check for signs of increased intraocular pressure?

Tonometry is the standard test used to measure intraocular pressure (IOP), which is critical for diagnosing conditions like glaucoma. This test helps to determine whether the pressure within the eyes is within a normal range or if it is elevated, which can lead to damage to the optic nerve and potential vision loss.

During tonometry, a small amount of pressure is applied to the eye, and the results indicate if the intraocular pressure is higher than what is considered normal. This is essential because high IOP is one of the primary risk factors for glaucoma, a serious eye condition that can result in blindness if left untreated.

The other tests mentioned focus on different aspects of eye health. A visual acuity test assesses how well a person can see at various distances, while a slit lamp examination provides a detailed look at the structures within the eye, including the cornea, lens, and retina. A fundus exam allows for the observation of the back of the eye, including the retina and optic nerve. While these exams are vital for overall eye health and can detect various eye conditions, they do not measure intraocular pressure specifically.