visual field examinations week 6 interpreting of visual fields
TRANSCRIPT
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Visual field Visual field examinationsexaminations
Week 6 Interpreting of visual fields
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Interpreting the dataInterpreting the data
Is it a legitimate defect? ( tech or patient error)
Is the defect in one or both eyes?What part of the pathway is effected
because of the defect shown?Does the VF make sense? (Compared to
the patient complaints and Dx.)Is there another VF to compare with this
VF?
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Is this a legitimate Is this a legitimate defect?defect?Technician error
•Wrong corrective lens•Poor instruction to patient•Forgot to patch patient’s eye•Lens holder to far from eye•Doing the wrong test•Entering wrong birthday•Dilating or not dilating pupil•Is it a depression, scotoma, or neurologic defect?
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Technician errorTechnician error
Wrong correction lensPupil was dilated 2nd time.
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Technician errorTechnician error
Lens holder to far away from eye. Wrong birth date
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Technician errorTechnician error
30-2 vs central 10 Poor patient instruction- false positives
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interpretationinterpretation
Is there a defect in one eye or both eyes?
If there is a defect in only one eye, it will be before the chiasm.
It can be retinal, glaucomatous, or nerveIf there is a defect in both eyes, is it
congruent or incongruent?If both eyes, is it neurological (chiasm and
beyond) or same problem in both eyes ?
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Interpretation of Visual FieldsInterpretation of Visual Fields
What part of the pathway has caused this defect?
Both eyes: glaucoma hx? Trauma? Macular degeneration?
Do the defects have horizontal or vertical respect?
Retinal, macular, nerve and glaucoma are considered to be the same problem happening in both eyes.
Defects that happen at or after the chiasm are effecting both eyes, but are a neurologic problem.
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Interpretation of visual fieldsInterpretation of visual fields
Pseudotumor causing papilledema Bitemporal hemianopia
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Interpreting visual fieldsInterpreting visual fields
Left eye Right eye
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Interpreting visual fieldsInterpreting visual fields
4 VF’s, you tell me!Both eyes effected, you tell me what’s wrong!
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Interpreting visual fieldsInterpreting visual fields
Right and left eyes both have a problem- What is wrong?
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Depression, step or scotoma? Depression, step or scotoma? Interpreting visual fieldsInterpreting visual fields
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Interpretation of Interpretation of visual fieldsvisual fieldsDoes this VF make sense?
If the patient came in for a 6 month repeat VF because of glaucoma, does this field match the Dx?
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Interpretation of Interpretation of visual fieldsvisual fieldsAre there other VF’s stored in the computer to compare with the most recent VF?
This is a printout of all the VF’s this patient has taken. With this printout of ALL VF’s taken, it is easy to see how the glaucomatous defects have progressed.
If something is out of the ordinary from what you expect- this comparison is a great way to look at all the past VF’s to figure out the problem.
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Interpreting glaucomatous field Interpreting glaucomatous field defectsdefects
Generalized depression
Arcuate scotoma
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Interpreting glaucomatous field Interpreting glaucomatous field defectsdefects
Nasal step Temporal wedge
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Interpreting glaucomatous field Interpreting glaucomatous field defectsdefects
Nerve fiber bundle, nasal step
Nerve fiber bundle, arcuate scotoma
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Interpreting glaucomatous field Interpreting glaucomatous field defectsdefects
End stage glaucoma End stage glaucoma
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Interpreting retinal field defectsInterpreting retinal field defects
Macular hole Retinal detachment
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Interpreting retinal field defectsInterpreting retinal field defects
Retinal scar due to ocular toxoplasmosis
Choroidal rupture after a blunt trauma causing a scar.
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Interpreting retinal field defectsInterpreting retinal field defects
Nerve fiber bundle defects OU
Followed after open heart surgery
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Interpreting retinal field defectsInterpreting retinal field defects
Diabetic retinopathy Retinal detachment
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Interpreting optic nerve field Interpreting optic nerve field defectsdefects
Optic neuritis OUUsually associated with MS, effects both eyes suddenly when this happens.
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Interpreting optic nerve field Interpreting optic nerve field defectsdefects
Optic atrophy VA 20/200 Papilledema OU
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Interpreting optic nerve field Interpreting optic nerve field defectsdefects
AION (anterior ischemic optic neuropathy) You guess now!!!
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Interpreting Chiasmal defectsInterpreting Chiasmal defects
bitemporal hemianopiaChiasmal defect, from a pituitary tumor
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Interpreting Chiasmal field Interpreting Chiasmal field defectsdefects
Bitemporal quadrant hemianopia
Bitemporal hemianopias at different stages
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Interpreting post chiasmal field Interpreting post chiasmal field defectsdefects
Homonymous quadrant hemianopia
Originating from a problem on the right or left side of the brain?
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Interpreting post chiasmal field Interpreting post chiasmal field defectsdefects
homonymous hemianopia, which side?
Homonymous hemianopia, which side?
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Interpreting visual field defectsInterpreting visual field defects
Now you try… What are these defects?
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Interpreting visual field defectsInterpreting visual field defects
Try again…. What are these defects?
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Interpreting visual field defectsInterpreting visual field defects
See…It’s not that hard after all!
You did a great job!