Pachymetry describes the measurement of corneal thickness in ophthalmology. It can be done in different ways. Contactless, it is determined using the Pentacam®. The thickness of the cornea influences the accuracy of different measurements and thus allows an accurate classification of the diagnosis. For example, corneal thickness is crucial for measuring accurate intraocular pressure in glaucoma. Even with various corneal diseases, the thickness of the corneal tissue must be known. The measurement is done by the Pentacam® and is a non-invasive diagnostic method.