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 Week 3  Visual Pathway and Visual field defects.

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Presentation on theme: " Week 3  Visual Pathway and Visual field defects."— Presentation transcript:

1  Week 3  Visual Pathway and Visual field defects

2  Monocular retinal zone  Nerve fiber/optic nerve zone  Binocular chiasmal zone  Post chiasmal zone

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4  Field defects are found opposite in the VF to the location of the damages in the eye.

5 RETINAL DETACHMENTVISUAL FIELD

6  Choroidal lesions care caused by tumors, inflammations, infection, or fluid leaks.  This type of damage does not respect the horizontal or vertical meridian.

7 EPI RETINAL MEMBRANE TEAR WITH BLEEDINGHAMANGIOBLASTOMA

8  Damage may be caused by toxicity, inflammation, infections or heredity.

9  A diffuse pattern of field loss ( rod damage) forming a ring a variable scotomas that will expand outward toward the periphery and inward toward the fovea until blindness results.

10  Damage to cone receptors causing damage to the central 5 degrees.  Decreased color and VA will result.

11  Retinal layer  Subretinal layer  Rods and cones  Retinitis pigmentosa  Macular pathology  All defects will be monocular.  Most pathology will be visible with a scope.  Lesions temporal to the fovea will present nasal on VF.  Lesions can cross all meridians.  Central scotomas will cause abnormal VA and color vision.

12  Nerve fiber layer.  Most common cause is glaucoma. Also may be caused by trauma, blood vessel occlusions, infections, inflammations and tumors

13  (swelling of the disc)  Produces a field loss by pushing the surrounding retina out from the disc creating an enlarged blind spot.  It will present more concentric than an enlarged blind spot caused by glaucoma.

14  Macular and papillomacular defects create central or ceccocentral scotomas

15  Bjerrum area of nerve fiber layer.  15 degrees off fixation.  Defect in this area will cause an arcing VF loss opposite of the damage.  Will start small and increase in size over time.

16  Nerve fiber layer  Optic nerve (papilledema)  Nerve fiber pattern defects  Bjerrum area defects  All defects are monocular.  Defect will point to the disc since the nerve fibers are traveling toward this point.  All pathology will be visible with a scope

17 GLAUCOMATOUS DEFECTS DAMAGE TO NERVE FIBER LAYER WILL SHOW ON VF.

18 TEMPORAL WEDGENASAL STEP

19 OPTIC NERVE CENTRAL SCOTOMAVISUAL FIELD

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21  All will be monocular only effecting the damaged eye.  Damage to the nerve fiber layer will be caused by glaucoma.  The VF will show up opposite of the damaged area.  Specific areas of nerve fibers that have been damaged will respect the horizontal meridian and point in the direction of the disc.  Disc problems will be visible with a scope.

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23  Caused by pituitary tumors or swelling,  Always bi temporal.  Not visible with a scope.  CT scan or MRI needed to show defect.  Bilateral hemianopia (temporal).  Will respect vertical meridian.  Will start small and gradually increase in size.  Bi temporal VF loss characteristics

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25 LATERAL GENICULATE BODYOPTIC RADIATIONS

26  Not visible with a scope.  Problem will be visible with CT or MRI scan.  Homonymous defect will always be present. (Same side)  Will start out small and gradually get larger.  Will be hemianopic and will respect the vertical meridian.

27  Follow the pathway-  Page 22 in your text.  What is this problem?

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31 See you next week for Goldmann Perimetry lecture.


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