Icare VET (=TonoVet) for easy animal eye pressure measuring The Icare VET tonometer is intended for use by general veterinary practitioners, veterinary ophthalmologists and other veterinary medical personnel. Icare VET is the tool to accurately measure intraocular pressure on animal patients, as it is painless and therefore creates no anxiety. The tonometer is based on a rebound measuring principle, in which a very light probe is used to make momentary contact with the cornea. The device is easy to use and the measurement is barely noticed by the animal and often does not even cause corneal reflex.