Visual field testing – or perimetry in other words – is a diagnostic method used in the case of suspicion of diseases or damage to the optic nerve or retina, as well as the basic diagnostic test for patients suffering from glaucoma. They are also used in the event of a need for a neurological analysis.
Perimetry allows for precise determination of defects in the field of view, which are a determinant fragments of the retina that do not receive light stimuli (in other words: defects in the field of view) due to disease processes taking place within it or due to the interruption of the road continuity nerves, which are responsible for transmitting stimuli to the visual centers in the brain. By examining the field of view, the doctor precisely analyzes the threshold of sensitivity of the retina in relation to correct level.
Computerized visual field examination is a completely painless and non-invasive method – it requires patient’s concentration and active cooperation with the doctor, who should be signaled in his course of light points. The device in front of which the patient sits is the so-called perimeter- equipped with a screen where micro lights appear and disappear.
The task of the subject is to cover one eye, look ahead and focus on the given eye, designated point. When you catch a light point, press the button indicated by the doctor. Thanks to which the place is recorded by computer and applied to the drawing the visual field map and test is completed. The result is then immediately interpreted and described by an ophthalmologist. The visual field examination is recommended in the case of a patient having diseases of the optic nerve, nervous system, retinal detachment and glaucoma, which predispose the patient to exercise perimetry regularly. It is prescribed by an ophthalmologist who performs it after prior examination of visual acuity.