Viral meningitis is common and contagious, but it is rarely serious or fatal and does not require antibiotics. The more serious meningococcal bacteria are the leading cause of meningitis in adolescents ages 11 to17, and while theyâre rare, they can be fatal.
Test Overview. A tonometry test measures the pressure inside your eye, which is called intraocular pressure (IOP). This test is used to check for glaucoma, an eye disease that can cause blindness by damaging the nerve in the back of the eye (optic nerve ).
Eye pressure is also called intraocular pressure (IOP) and is measured with a special tonometry device. Pressure is recorded in millimetres of mercury (mmHg). Normal eye pressure ranges from 10 to 21 mmHg. Ocular hypertension is defined as an eye pressure of greater than 21 mmHg on two consecutive occasions without glaucoma changes being present. The optometrist or ophthalmologist will verify the eye pressure findings with a procedure called pachymetry to measure the corneal thickness with an ultrasound probe.