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| Since the optic nerve is relatively strong, it can often withstand years of elevated eye pressure before damage occurs. The front of each eyeball is filled with a watery fluid called the aqueous humour, which is continually produced and drains from the front of the eye through a small channel. There are two sorts of glaucoma: gradual onset (chronic) and sudden onset (acute). In those with acute or 'closed-angle' glaucoma, symptoms start suddenly and usually affect only one eye. There may be nausea and vomiting. Although most symptoms disappear after treatment with medication, there may be some remaining loss of peripheral vision. Using a microscope, the tonometer is then brought in close so that it lightly touches the surface of the eye. The procedure takes only a moment or two and is painless. There are some other tests that may be done. |
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