Zeiss Visual Field
The visual field is the entire area that can be seen when the eye is directed forward, including that which is seen with peripheral vision. The visual field can be tested to measure the extent and sensitivity of the field of vision.
Since one eye makes up for vision loss that the other eye may be experiencing, the test is done with each eye individually and can pick up visual field loss that the patient may not even notice.
In order to have a full visual field, not only does the eye need to be functioning properly but also the entire pathway from the eye to the occipital cortex, the visual processing center in the back of the brain, must be uninterrupted. Therefore, the visual field test is both an eye and brain test.
Full Visual Field
Many diseases can adversely affect the visual field including:
(damage to the visual pathways of the brain)
Hydroxychloroquine/Plaquenil (oral medication)