Corneal Pachymetry is a test to measure the thickness of your cornea. The measurement is done in micrometers or microns.
Gonioscopy is a test for Glaucoma which measures the angle between the cornea and the iris.
Perimetry is the measurement of your visual field function. This helps in testing your peripheral or side vision.
Optical Coherence Tomography (OCT) is an imaging technique which makes it possible to obtain a 3D view of your retina
The eye is a hollow structure, and is filled with fluid, which inflates the eye and gives the eye its shape. Fluid is made inside the eye and drains out of the eye at a relatively constant rate,