Question 1

how is a visual field examination for an eye done?

Accepted Answer

A perimeter: Visual fields are mapped out using a device called a perimeter.  Most are computer driven but a few a done manually.  You will asked to fixate a target with an exposed eye (the other is covered) and identify the target spot somewhere in the dome of the machine.  Multiple points are tested and recorded.  This produces a MAP of retinal sensitivity, useful for analyzing the vision of your retina.

Question 2

what method is a visual field examination for an eye is conducted?

Accepted Answer

Several devices: The basic instrument is called a perimeter.  An array of LEDs in a dome are presented and the subject presses a signal button to register when seen.  This produces a grey scale map of the visual sensitivity.  Another device presents a dot of light of varying size and intensity also identified by the subject which can be then mapped out as the field.  These are painless and sometimes fun tests.

Question 3

i had visual field test with 0 fixation losses and 0 false positives- 0false neg felt my eye maybe moved around.is field accurate still? nml

Accepted Answer

Good result: With zero fixation losses and zero false positives, your performance at the test was likely to be flawless and the results fully reliable.

Question 4

how big of a visual field defect would be an eye problem while driving?

Accepted Answer

20-30% reduction: Usually after a 20-30% reduction, difficulty with eye fatigue and loss of effective night vision is noted.  Believed that excessive hooding to that level forces drivers to lift their head when driving at night, resulting in excessive glare and loss of "gray" colors needed for depth perception.  Use of visual field analysis in most eye doctor offices can measure the degree of loss.

Question 5

yesterday, i started having cloudy vision in one eye - when i look through only that eye, about 50% of visual field is gone.  what to do?

Accepted Answer

See an eye doctor: Vision is very precious and often sudden loss of vision is not a good sign. If it is back to normal, consider yourself lucky. I would recommend seeing your doc or an eye doc for an evaluation as soon as you can. Dizziness with blurry vision etc..Typically occurs on both sides, so your one-sided symptom is concerning.
 Consult doc asap.  Good luck.

Question 6

in unilateral glaucoma with advanced visual field loss in that eye but perfect vision in unaffected eye is it safe to drive relying on good eye?

Accepted Answer

Generally yes: With 1 normally functioning eye &amp; 1 that has severe visual field loss, your function is largely dependent on your ability to adapt to the missing field areas. As an American driver, visual field loss in the left hemifield &amp; diffuse visually field loss in the right eye was associated with more driving impairment. Interestingly, a large % of monocular patients did well driving. Driving skills vary.

Question 7

is 20/400 in both eyes better or worse than 20/200? i am trying to determine if i am considered legally blind using the following definition "if your vision cannot be corrected to better than 20/200 in your better eye, or if your visual field is 20 degree

Accepted Answer

The : The vision scale works like this. Consider the first number to be x and the second to be y. When you are looking at something x feet away, you are able to discern it as though it is at y feet away. 
So with 20/400 vision. You see an object at 20 feet away as well as someone with good vision can see something 400 feet away.
So, 20/400 is worse than 20/200.

Question 8

what produces blindness in the peripheral visual field of each eye's temporal hemiretinal half?

Accepted Answer

Hemi-field loss: Is usually due to a pathology posterior (behind) to the eye itself. A lesion or area of pathology will usually be located from the area of the pituitary gland (approx.  just forward of central brain) where the optic nerves cross to anywhere along the optic radiation ending at the occipital lobe (portion of the brain at the lower back of the skull). An MRI or CT can usually identify the cause.

Question 9

when i press the centre of my eyes near my nose bridge, i see a black shadow at the temporal side of my visual field. why is it so?

Accepted Answer

See in reverse!: The black circle you see is also surrounded by an orange circle.  This is direct stimulation of the retina!  but the world is seen in reverse so that is why nasal stimulation is a temporal image.

Question 10

just saw eye doc for plaquenil exam.now have to go back in a week for 10-2 visual field study. is this a quick test or do i need to see doc again?

Accepted Answer

Yes to visual field: In general plaquenil is a very safe medication. The recent guidelines are to get a baseline eye exam when starting plaquenil and then once per year. They are screening you for a rare complication from plaquenil called maculopathy. This is very rare but the rate slightl goes up after being on the drug after 5 years. So yes go get the visual field test.

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Eye exercises for a visual field cut

A member asked:

How is a visual field examination for an eye done?

A member asked:

What method is a visual field examination for an eye is conducted?

A member asked:

I had visual field test with 0 fixation losses and 0 false positives- 0false neg felt my eye maybe moved around.is field accurate still? nml

A member asked:

How big of a visual field defect would be an eye problem while driving?

A member asked:

Yesterday, i started having cloudy vision in one eye - when i look through only that eye, about 50% of visual field is gone. what to do?

A member asked:

In unilateral glaucoma with advanced visual field loss in that eye but perfect vision in unaffected eye is it safe to drive relying on good eye?

A member asked:

Is 20/400 in both eyes better or worse than 20/200? i am trying to determine if i am considered legally blind using the following definition "if your vision cannot be corrected to better than 20/200 in your better eye, or if your visual field is 20 degree

A member asked:

What produces blindness in the peripheral visual field of each eye's temporal hemiretinal half?

A member asked:

When i press the centre of my eyes near my nose bridge, i see a black shadow at the temporal side of my visual field. why is it so?

A member asked:

Just saw eye doc for plaquenil exam.now have to go back in a week for 10-2 visual field study. is this a quick test or do i need to see doc again?

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