Computerized perimetry

Computerized perimetry (also known as visual field) tests the entire peripheral (lateral) visual field.

What does Computerized perimetry involve?

The operating principle of perimetry can be outlined using the automatic static perimetry procedure as a template. The perimeter is linked to a virtual program on the computer. The program tests the 30 central degrees of the visual field using a grid spaced six degrees apart.

The perimetry test is performed on each eye in turn, fully covered to avoid errors. You will be asked to look straight ahead to avoid testing central vision. A perimetry test (visual field test) measures all areas of vision, including lateral or peripheral vision.

To perform the test, you will sit in a chair and look through the inside of a bowl-shaped instrument called a perimeter. As you look into the center of the bowl, lights flash. Press a button each time you see a flash. A computer records the time and place of each flash and whether you pressed the button when the light flashed at that point.

At the end of the test, the printed results show whether there are any areas of your vision where you did not see the flashes of light. These are areas of vision loss. Peripheral vision loss is often an early sign of glaucoma.

What can be diagnosed by Computerized perimetry?

Computerized perimetry (visual field) is most commonly used in the diagnosis of glaucoma, and to supplement other tests, for cataract, optic neuropathy, retinopathy of pigmentation, etc. It is recommended as a routine preventive investigation after the age of 45-50 years, especially if the patient suffers from ocular hypertension. A perimetry test can help find certain patterns of vision loss. This may mean that there is some type of eye disease. It is very useful in finding early changes in vision caused by nerve damage due to glaucoma. Periodic perimetry tests can be used to see if glaucoma treatment prevents further vision loss. The amount of peripheral vision loss is related to the amount of optic nerve damage.

A perimetry test performs a detailed record of visual fields. Basic information, descriptions or drawings can be compared with future test results.

The Tomey AP-2000 perimeter, used in Dr. Holhoș clinics, offers a modern eye tracking system, LED technology, controlled digital camera, pupil measurement and custom testing programs.

Text medically reviewed by Dr. Teodor Holhoș, Ophthalmic Surgeon
Written by Dr. Holhos Team

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