Schiotz tonometer

The Schiotz tonometer is designed to measure intraocular pressure to establish the presence and severity of glaucoma. Glaucoma is characterised by optic nerve damage which usually results from fluid retention in the eye. The device shown is an ‘indentation tonometer’ which utilises a plunger which attaches to the cornea, connected to a measurement footplate to produce a pressure reading. A higher reading is predictive of glaucoma. The device is named in honour of its Norwegian-born creator, Dr Hjalmar Schiotz, who was an adjunct director of the ophthalmology clinic of The Sorbonne.