How is peripheral vision checked?

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 much peripheral vision is normal?

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.

How do you examine a visual field?

During an eye exam, visual field testing is performed one eye at a time, with the opposite eye completely covered to avoid errors. In all testing, the patient must look straight ahead at all times in order accurately map the peripheral visual field.

Is loss of peripheral vision a disability?

Yes, peripheral vision loss is considered a disability, since the loss of peripheral vision can affect one or both eyes, hindering the interaction of the individual with their surroundings.

How is central and peripheral vision tested?

Central and peripheral vision is tested by using visual field tests. Careful detection of visual field defects can be diagnostic of many eye and/or neurological conditions, including glaucoma or retinitis pigmentosa. In glaucoma – as well as other conditions – it is vital to repeat visual field testing to track any changes over time.

How do you test for normal visual fields?

A comparison of examiner and patient fields is made, the assumption being that you, as the examiner, have normal visual fields (this is another reason why you should undergo visual field testing yourself). First test the binocular visual field and then test each eye separately.

What is a skilled interpretation of a visual field test?

2 Skilled interpretation of visual field tests requires a good grasp and application of this prior knowledge. The fovea is the area of greatest visual sensitivity, where the cone photoreceptor density is at its highest. The visual sensitivity slopes off further from the fovea.

How do you interpret a Goldmann visual field test?

Both tests can complement each other, confirming deficit patterns when in doubt. The key to interpreting Goldmann visual fields is to keep in mind the normal hill of vision ( figure 1) and how it compares with the patient’s results. The skill is in identifying patterns and observing any change with repeated tests.