The most common visual field test uses
a light spot that is repeatedly presented in different areas of your peripheral vision
. Less common testing may be performed by a technician manually moving a target to map areas of damage.
How do you test visual field at home?
Do the test with each eye separately, first the right and then the left. Hold the test grid right in front of you, 14 inches (35 centimeters) away from your eye.
Look at the dot in the center of the grid
, not at the grid pattern. While looking at the dot, you will see the rest of the grid in your peripheral vision.
How do you test for visual field defects?
During a visual field acuity test, also called
a perimetry test
, you will respond to a series of flashing lights while looking straight ahead. Your responses will help the doctor determine whether you have a visual field loss. The area of vision loss gives clues as to where in the visual pathway a problem has occured.
Can you cheat on a visual field test?
Visual field defect simulations were exaggerated beyond what was reasonable. Conclusion: This study reports on whether it is possible to cheat with automatic perimetry. The different parameters analyzed by computer programs are not
able
to detect cheating patients.
What does an abnormal visual field test mean?
A test that shows
visual field loss
means that vision in some areas is not as sensitive as normal. It could be just a little vision lost in a small area, or all vision lost in large areas. The amount of vision lost and the areas affected are measured by the visual field test.
Do I wear my glasses for visual field test?
Yes,
patients can wear their normal glasses, contacts or a trial frame
if needed during visiual field testing on a Matrix 800.
What is the minimum visual field for driving?
Under California law, a driver must have a minimum visual acuity of
at least 20/200 in one eye
, with or without correction.
How accurate is visual field test?
Results: Overall,
patients performed reliably in 52% of visual field tests
. The most common cause of poor reliability was fixation loss, with 43% of patient tests deemed unreliable due to a fixation loss rate greater than 20%.
How do you pass a visual field test?
During the test,
one eye is covered
(so that one eye is tested at a time), and you want to always look straight ahead at the steady yellow light. Then, other lights flash one at a time off to the side and you should press the button whenever you see one of these lights.
Can you drive with visual field loss?
A diagnosis of hemianopia
Can I drive if I fail a field vision test?
Clearly
if there is significant visual field loss, then it is unsafe to drive
but if the loss is borderline by the DVLA standards, then it is important to be aware that you do not simply give up.
Who needs a visual field test?
Visual field tests are especially
important in the treatment of glaucoma
. These tests will tell the doctor if vision is being lost even before the patient notices. That is just one of the reasons why people who have glaucoma need to keep all their appointments with their doctor.
What is a normal visual field test result?
A normal visual field is an island of vision measuring
90 degrees temporally to central Fixation, 50 degrees superiorly and nasally
, and 60 degrees inferiorly. Visual acuity increases from movement discrimination in the extreme peripheral vision to better than 20/20 in the center of vision.
How often should a visual field test be done?
A minimum for most patients is a check of IOP at least every 6 months, a visual field test
at least once every 12 months
, and some assessment of your optic nerve health (possibly via HRT or OCT ) at least once every 12 months.
How can I improve my vision field of driving?
- Make sure your windshield and windows (inside and out), headlights and taillights are clean.
- Wear clean corrective glasses or contact lenses with an up-to-date prescription.
- Make sure your mirrors are always properly adjusted.
Is minus 5 eyesight bad?
If your number is between -0.25 and -2.00, you have mild nearsightedness. If your number is between -2.25 and -5.00, you have moderate nearsightedness. If your number is lower than -5.00, you
have high nearsightedness
.
