< b>Field, visual: 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 distribution of the
field of vision. The test may be done by a number of methods including what are
termed confrontation, tangent screen exam and automated perimetry. Many diseases
can adversely affect the visual field including glaucoma, strokes, high blood pressure
(hypertension), diabetes, multiple sclerosis, overactivity of the thyroid gland
(hyperthyroidism). Medications can also affect the visual field, some of which include
the antimalarial medicines chloroquine (ATABRINE) and hydroxychloroquine (PLAQUENIL).
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