Diagnostic Tests

Visual Field

This is an evaluation of the visual field outside the central field which allows for the function of reading and writing.

Figure 1. Visual field analysis of a healthy individual.

The evaluation of the visual field is made using equipment specially developed for this (automatic computerised perimeter) whereby the patient focuses on a single central point with the other eye closed and the area which can be seen is measured. In addition a simple visual field test, the confrontation test, can be used without any special equipment with the patient seated facing the doctor. In Eye Diseases practice, automatic computerised perimeter machinnes are often used, although the results are not reliable for patients with compliancy problems.  

Figure 2. A representative sample of visual field deficits associated with glaucoma.

The patient sits in front of the machine with one eye closed  and preses a buton held in their hand every time a light is seen in front of them. A graphic is produced of where the patient can and cannot see. This test gives valuable information in revealing optical pathway pathologies from the optic nerve to the visual centre in the brain, particularly in the diagnosis and monitoring of glaucoma.

Figure 3. A representative sample of bitemporal visual field deficits associated with pituitary adenoma.