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Also known as a visual field test, a perimeter uses a special system to determine and measure the reaction of the eye to different types of light sensitivity. This advanced device comes with a tangent screen, which is a big white screen that is placed in front of the patient’s field of vision. There is also a Goldmann perimeter, which is shaped more like a sphere and uses different types of light to test the sensitivity of the eyes. More features of perimeters include:
Computerized projection abilities
Video eye monitors
Alternative options for patients with low vision
Automatic calibration features
Stimulus intensity measurements
Multiple screens and screening abilities
Color options, as well as greyscale
Convenient LED display
Perimeters typically grant a full field of vision, which is great for testing a number of different eye functions. The ophthalmologist can accurately see the results of the test through a screen, and can chart down the eye’s reactions to the stimulus in real time.
How perimeters work
Perimeters use automated or computerized stimuli to test the patient’s field of vision. It is also used to test changes in the vision of glaucoma patients over time. With automated perimetry, the examiner can press a number of single buttons to activate features that will test different parts of the patient’s vision. The computerized perimeter will map out the patient’s visual field in an aesthetic display that is easy for the examiner to read. This happens after the perimeter uses a series of lights on a screen, and the patient must click a button whenever they see the light.
Perimeters are computerized devices that are used to measure a patient’s field of vision. They are great for diagnosing possible medical ailments such as a stroke, pituitary disease, glaucoma, or even brain tumors. The visual field test will send out signals that the patient will either see or they will not see, depending on the level of their vision. If they are unable to see certain lights on the screen, it can send up some red flags and alert the examiner that there may be something wrong with the eyes. Other perimeters tests include tangent screen exams and Humphrey field exams.