To measure peripheral (side) and central vision, the eye doctor will perform visual field tests during an eye examination. The results of this test can show the physician if there are any defects or gaps in the visual field.
According to the American Academy of Ophthalmology, conditions such as glaucoma or diseases of the optic nerve or retina, as well as specific brain conditions such as strokes or tumours, can be detected according to the results of a visual field examination.
Confrontation Visual Field Test
Confrontation visual field testing is performed by the physician in the office using a target or even fingers.
Tangent Screen Test
The tangent screen test uses a black or white screen with a moving test object to create the visual field map.
Automated perimetry testing uses a machine that flashes random lights in the visual field and the person presses a button when the light can be seen.
An Amsler grid tests the central visual field and is a black grid on white paper. It is often used to detect macular degeneration.
The first time a person takes this test, the flashing lights and moving targets may be confusing, which can lead to an inaccurate result. Often, physicians will repeat the first visual field test to ensure that the visual field that is mapped out is the actual visual field.
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