Marcus Gunn Pupil PDF

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Marcus Gunn Pupil...

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Assignment Name: Ooi Wei Hang Student ID: 1001956425 Marcus Gunn Pupil Definition: Marcus Gunn Pupil is the paradoxical response of a pupil to light in the presence of a relative afferent pathway defect (RAPD). Causes: (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) (x) (xi)

Incomplete optic nerve lesion Optic neuritis (Inflammation of optic nerve) Optic atrophy (Death of retinal ganglion cell axons due to other causes) Retinal detachment Central retinal artery occlusion Ischemic central retinal vein occlusion (decreased blood supply) Severe glaucoma, which can damage optic nerve Optic nerve tumor Unilateral macular degeneration Severe lazy eye Retinal infection

Test: Swinging flashlight test. Normally during the test, both pupils will constrict equally and the pupil which light is transferred remains tightly constricted. In the presence of RAPD in one eye, the affected pupil will dilate (paradoxical response) when the flashlight is moved from the normal eye to the abnormal eye. This response is called Marcus Gunn pupil and it is the earliest indication of optic nerve disease even in the presence of a normal visual acuity. Treatment: Marcus Gunn pupil is not treated directly. Hence, it is treated by treating the cause of Marcus Gunn pupil....