What is a Humphrey visual field test?

The Humphrey visual field test measures the entire area of peripheral vision that can be seen while the eye is focused on a central point. Last Updated: October 27, 2020. During this test, lights of varying intensities appear in different parts of the visual field while the patient’s eye is focused on a certain spot.

What is a Humphrey 24 2 visual field test?

24-2: Measures 24 degrees temporally and 30 degrees nasally and tests 54 points. Used for neuro-ophthalmic conditions and general screening as well as early detection of glaucoma. 30-2: Measures 30 degrees temporally and nasally and tests 76 points. Used for general screening, early glaucoma and neurological conditions.

How do you read Humphrey visual field results?

A typical “normal” dB reading is around 30. The numeric dB graph should be studied next. 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 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.

Can you drive with visual field loss?

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.

What is the difference between SITA Standard and SITA Fast?

In the 20 to 5 dB range, SITA Fast was less precise than SITA Standard; this difference was largest between 15 to 10 dB, where variability in both methods peaked. Translated to median time to detection, differences in measurement precision were negligible, suggesting minimal effects on time to detect progression.

At what age does glaucoma usually occur?

Glaucoma is the second-leading cause of blindness in the U.S. It most often occurs in people over age 40, although an infant (congenital) form of glaucoma exists.

What is acceptable vision for driving?

When you apply for your license, the DMV will check your vision. You must have at least 20/40 vision with both eyes. If you cannot see at this level without glasses or contacts, you are legally required to wear glasses or contact lenses every time you drive.

What SITA fast?

If time savings achieved by switching from SITA Standard, or SITA Fast, to SITA Faster are used to increase the frequency of visual field testing, progression can be detected and rate of progression assessed sooner than before.

How big of a stimulus do you need for the Humphrey perimeter?

For the Humphrey perimeter, a test stimulus of 4 mm 2 (corresponding to a Goldmann size III stimulus) is most commonly used, though larger stimulus sizes may be employed for individuals with poor visual acuity. The Humphrey perimeter tests light intensities over 5 orders of magnitudes, from 10,000 apostilbs (asb) to 0.1 asb.

Which is the fastest Humphrey field analyzer 3?

Humphrey FDT Humphrey Matrix 800 HFA3 840 850 860 Test specifications Maximum temporal range (degrees) 30 30 90 90 90 Stimulus duration 200-400 ms 300 ms 200 ms 200 ms 200 ms Visual field testing distance Infinity Infinity 30 cm 30 cm 30 cm Background illumination 100 cd/m2100 cd/m 31.5 ASB 31.5 ASB 31.5 ASB Threshold test library N-30� � C-20�

Which is more sensitive Humphrey matrix or perimetry?

In fact, Matrix appears to be more sensitive than automated perimetry and the SWAP visual field test that’s administered on the Humphrey Field Visual Analyzer II. Also, it tests slightly different parts and functions of the ganglion cells than the original FDT instrument.

Which is better the Humphrey matrix or swap?

“The Matrix visual field test is very easy to administer,” he notes. “The instrument itself takes up significantly less space than the Humphrey visual field analyzer, and the sensitivity of Matrix is pretty much as high as SWAP. It’s a good screening tool, and patients seem to prefer it to the regular Humphrey analyzer.