What do the results of a peripheral visual field test mean?
What do the results of the visual field test mean? A “normal” visual field test means that the patient can see about as well as anyone else does in the center and around the edges of the visual field. A test that shows visual field loss means that vision in some areas is not as sensitive as normal.
How do you read a visual field study?
Visual fields are frequently evaluated by simply covering one eye and asking the patient to look straight ahead while using peripheral vision to identify an object, or the number of fingers shown by the examiner. The field is often tested at only four locations, which is sensitive only for large field defects.
How would you describe visual field defects?
Visual Field Defects Symptoms Vision loss in one eye may indicate a problem in the eye, whereas the same visual field defect in both eyes may signal a problem in the brain. Signs that you may have a visual field defect include: Bumping into things. Knocking over objects when reaching.
How do you read Humphrey visual field results?
The dBs tested by the Humphrey analyzer range between 0 and 50 dB (0 is the brightest and 50 is the dimmest). A value of 0 means the patient could not see the brightest target, and a 50 means the dimmest target was seen.
What is normal peripheral vision degrees?
This type of vision is the result of different nerve cells and rods located outside of the macula. As compared to animals, humans have a limited peripheral view. A normal visual field for a person covers 170 degrees around, while peripheral vision covers 100 degrees of this field.
What does a failed field vision test mean?
Visual field loss in one eye is usually caused by a condition affecting the eye or the optic nerve, like multiple sclerosis or a tumor affecting the eye. Visual field loss in both eyes that is unequal usually means there is a disease process affecting the eyes, like diabetes or glaucoma.
What are the ocular diseases that can cause visual field defects?
Causes of visual field defects are numerous and include glaucoma, vascular disease, tumours, retinal disease, hereditary disease, optic neuritis and other inflammatory processes, nutritional deficiencies, toxins, and drugs.
How do I read my glaucoma test results?
According to the Glaucoma Research Foundation, the range for normal pressure is 12 – 22 mm Hg. When the pressure exceeds 22 mm Hg, that usually indicates an abnormal glaucoma test. People with pressure around 16 mm Hg or higher may also be at risk for normal tension glaucoma.
What is the most common pattern of visual field loss in glaucoma?
Typical glaucomatous visual field loss is characterized by arcuate defects, nasal steps, and other patterns corresponding to the course of retinal nerve fibers that respect the nasal horizontal meridian and usually spare the visual field center.