A pachymeter is a device for measuring the thickness of the cornea using ultrasound techniques. This gives us the thickness of the cornea in microns. It useful in diagnosing and managing such thinning conditions as keratoconus; or determining the state of swelling in conditions such as Fuch’s dystrophy. It is also an essential component in the diagnosis and management of glaucoma!! The thickness of the corneal correlates the measured pressures of the eye. We manage glaucoma with drops that lower this pressure. To be able accurately determine a patient’s current eye pressures; we need to have a pachymetry reading. This makes a pachymeter an essential tool for a practice managing glaucoma.