How do you explain visual fields?
The visual field refers to the total area in which objects can be seen in the side (peripheral) vision as you focus your eyes on a central point.
How do you read visual field results?
Use this order to interpret your Humphrey visual field every time:
- Confirm it’s the right patient with name and date of birth.
- Confirm it’s the right/left eye.
- Look at the reliability indices.
- Look at the pattern.
- Look at the GHT, mean deviation, VFI, and pattern standard deviation.
- Compare to the previous visual fields.
What do visual field test results mean?
A visual field test can help diagnose scotomas , or blind spots. It can also help identify loss of peripheral or side vision. Loss of side vision is an indicator of glaucoma, a disease that can lead to blindness. This article describes what to expect during a visual field test, why it’s done, and what the results mean.
How long does a visual field take?
The test, which measures the central and side vision for each eye, takes approximately 5-10 minutes, and you can blink normally throughout. 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.
What is normal visual field?
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.
Do they dilate your eyes for a visual field test?
Part of a glaucoma examination is formal visual field testing, where your peripheral, or side vision, is tested. Ideally, your eyes are not dilated during this test. Finally, there are other parts of the front of the eye, the iris for example, which should be examined when your eyes are not dilated.
How accurate is a 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%.