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Special Testing
for Glaucoma
There is no single test for glaucoma.
Patients with or suspected of having glaucoma will find the
following diagnostic and treatment tools in use at MarinEyes:
Tonometry measures eye
pressure. At Marin Eyes, we use applanation tonometry, because it is the most accurate
method available. Applanation tonometry is quick and painless.
Pachymetry measures the corneal thickness
ultrasound (sonar). Thin corneas may predispose a patient to glaucoma, whereas thick
corneas may occasionally be considered somewhat protective.
Gonioscopy
A special viewing lens (gonioprism) is used after numbing the eye with a drop of anesthetic. This
test is to distinguish open angle from narrow angle glaucoma, the two main
categories of glaucoma.
Visual field tests
Early damage from glaucoma can often be detected by this test. At Marin Eyes, we uses the latest computerized technology to
assess peripheral vision. Currently we are using the Humphrey SITA 24-2
test. The visual field
examination is repeated annually to monitor for progression of glaucoma
damage. The physician's assessment is enhanced by use of glaucoma progression
analysis ("GPA") computer
software.
Nerve fiber analysis
A scanning low-energy laser measures the optic nerve and the thickness of the
nerve fiber layer (the nerve that carries the vision message from the eye to the
brain). This is the nerve that is damaged in glaucoma. This testing is performed by
our state of the art "OCT", a scanning instrument with computerized
image processing and analysis. The test is usually repeated annually. |