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Eye pressure test: A routine part of every routine eye exam that measures the fluid pressure inside the eye. The test is called tonometry. Increased pressure within the eye can be a sign of glaucoma, a common and potentially very serious eye problem, if it is not detected and treated promptly.
Absolute pressure sensor; This sensor measures the pressure relative to perfect vacuum. Gauge pressure sensor; This sensor measures the pressure relative to atmospheric pressure. A tire pressure gauge is an example of gauge pressure measurement; when it indicates zero, then the pressure it is measuring is the same as the ambient pressure. Vacuum pressure sensor; This term can cause confusion.