What Does Tonometry Reveal?
Tonometry measures intraocular pressure to diagnose glaucoma . Glaucoma is caused by the buildup of fluid within the eye. Abnormally high pressure can damage the optic nerve, leading to vision loss. Tonometry is also useful for identifying low IOP, which may occur with anterior uveitis (inflammation within the eye) or following intraocular surgery. Low IOP is also associated with dehydration. Normal values vary between species of animals, and sometimes vary between breeds and individuals. Normal values are also affected by the technique used to measure them, so values are usually given as a range. Normal ranges are as follows: Cat: 15-30 mmHg Values that differ between eyes are considered significant if the difference is > 8 mmHg. How is Tonometry Performed? There are two methods of measuring IOP in animals: indentation tonometry and applanation tonometry. With indentation tonometry, the measuring instrument applies a rod of a certain weight to the surface of the cornea. The distance t
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