A standard eye test that is done to determine the fluid pressure inside the eye. Increased pressure is a possible sign of glaucoma, a common and potentially very serious problem if not detected and treated promptly. The pressure inside the eye is measured from the outside. In most cases, the pressure can be measured without anything actually touching the eye. The patient looks at an instrument that blows a small puff of air into the eye and then uses a special kind of sensor to detect the amount of indentation that the air puff causes on the surface of the eye. This indentation is normal and lasts only a fraction of a second. If patients need to have their eye pressure measured when this type of machine is not available (as in an emergency room), the pressure can be measured with an instrument that resembles a pen. One end of the instrument is placed on the surface of the eyeball. This feels like having a contact lens put in the eye. Tonometry does not cause significant pain and it is risk free.
Pertaining to the spatial arrangement of where sound is perceived, transmitted, or received. There is tonotopy in the cochlea, the small snail-like structure in the inner ear that sends information about sound to the brain. There is also tonotopy in the human auditory cortex, that part of the brain that receives and interprets sound information. […]
The spatial arrangement of where sound is perceived, transmitted, or received. There is tonotopy in the cochlea, the small snail-like structure in the inner ear that sends information about sound to the brain. There is also tonotopy in the human auditory cortex, that part of the brain that receives and interprets sound information. From tono- […]
- Tonsil stone
A tiny stone (calculus) in the tonsils. These stones, called tonsilloliths, are found within little pockets (crypts) in the tonsils that typically form in chronic recurrent tonsillitis and harbor bacteria. The stones are foul-smelling. They tend to contain high quantities of sulfa. When crushed, they give off the characteristic rotten egg smell which is well […]
- Tonsillectomy Medical Definition
The surgical removal of both tonsils. This procedure is sometimes performed together with the removal of the adenoid, known as an adenoidectomy. Recurrent infections or obstructive sleep apnea (OSA) in sleep-disordered children are among the reasons that a tonsillectomy and/or adenoidectomy may be performed.
Inflammation of one or both tonsils, typically as a result of infection by a virus or ‘bacteria.