21. Types of tonometry The newest Advancement in tonometry is DIATON TONOMETER – It measures intraocular pressure (IOP) through the Eyelid. Diaton Tonometer is intended for use by Inpatient & Outpatient Clinics such as Hospitals, Emergency Rooms, Nursing & Elderly Homes, General & Specialty Practitioners as well as Ophthalmologists and Optometrists. DIATON Requires No Contact with Cornea No Anesthetic Drops, No Risk of Infecting