Doctor insights on:
Eye Exercises For A Visual Field Cut
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.
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.
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
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.
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.
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?
Generally yes: With 1 normally functioning eye & 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 & 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.
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?
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.See 1 more doctor answer
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
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.
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?
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.
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?
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.
I tend to get scotomas obscurring my visual field and am known with high pressures of both eyes- 20. With no family history of glaucoma, what can I do?
Yes: Visual field testing will occasionally pickup small areas of visual field depressions if the floater is particularly large and thick, as some patients may have. Since they move, a repeat visual field should also show the depression to have moved. I would not however expect a large visual field abnormality from a floater and certainly l recommend an exam to rule out any problems by an eye md.See 1 more doctor answer
Mild glaucoma, rt. Eye w/full visual field 10 mos. Ago. DMV tested peripheral 50 degrees left, 70 deg right. My doctor thinks test wrong. I hope so.
Go to your eye docto: Have your eye doctor check Intraocular pressures and test your peripheral visual fields!
Two eye drs. Looking at visual field test result. One dr says it is normal & other says there's peripheral vision loss. Why the difference of opinion?
Interpretation: Interpretation of visual field change is somewhat subjective. As many as 5 cosequetive visual fields are necessary to show change over time. Peripheral changes can have a lot of "noise" in deciding whether or not it is real defect or not. Repetition of field testing and confirmation of defect over time is more accurate. Even then, there are many factors that can interfere in vf assessment.
23 old male is complaining from a black spot on visual field in one eye, normal mri, normal fundus and normal intracranial pressure. What can be this?
Many things: Sounds like the problem is in the eye, not the brain. You need a complete eye exam to determine the cause.
Blurry vision lower quarter visual field of left eye (is like a greasy film over bottom quarter of eye.) Blood pressure perfect.
Pain to move left eye, blurry vision lower 1/2 visual field that eye only (is like a greasy film over bottom 1/2 of eye). Blood pressure perfect?
Optic neuritis: You need to see an ophthalmologist asap. The biggest concern in a woman your age would be optic neuritis. This would explain your symptoms best. You need a thorough exam by an ophthalmologist first the ophthalmologist may order an MRI or have you see a neurologist depending on the findings.See 1 more doctor answer