The determination of the visual field is used to diagnose glaucoma and intracranial tumors.
It determines the field width seen by the patient making him secure a point straight ahead. The doctor sets curves connecting the equal retinal sensitivity point (isopter).
The seated patient, a masked eye, fixed centrally.
He is presented with a light test, the location and intensity is changed.
The patient reported the test every time he sees it.
The ophthalmologist has a perimeter layout of the field on which it is possible to notice a blind spot or a central scotoma corresponding to the papilla and the eye that may be larger than normal.
The field can be narrowed over its entire circumference or on a part.
All these signs detect a retinal disease, tumor, vascular or glaucomatous eye.
We must complete the assessment by inta-ocular pressure measurements, neuro-radiological examination and electrophysiological.
When a myopic patient must regularly change corrective lenses, advise her to see his ophthalmologist because it can be an early sign of AMD (macular degeneration).