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  2. Relative afferent pupillary defect - Wikipedia

    en.wikipedia.org/wiki/Relative_afferent_pupillar...

    The left optic nerve and the optic tracts. A Marcus Gunn pupil indicates an afferent defect, usually at the level of the retina or optic nerve . Moving a bright light from the unaffected eye to the affected eye would cause both eyes to dilate, because the ability to perceive the bright light is diminished.

  3. Optic neuritis - Wikipedia

    en.wikipedia.org/wiki/Optic_neuritis

    The repetition of an idiopathic optic neuritis is considered a distinct clinical condition, and when it shows demyelination, it has been found to be associated to anti-MOG and AQP4-negative neuromyelitis optica. [20] When an inflammatory recurrent optic neuritis is not demyelinating, it is called chronic relapsing inflammatory optic neuropathy ...

  4. Neuromyelitis optica spectrum disorder - Wikipedia

    en.wikipedia.org/wiki/Neuromyelitis_optica...

    The second most common initial manifestation of the disease is inflammation of the optic nerve and/or optic chiasm (optic neuritis, ON). [4] ON may lead to varying degrees of visual impairment with decreased visual acuity , although visual field defects, or loss of color vision , may occur in isolation or prior to formal loss of visual acuity.

  5. Visual pathway lesions - Wikipedia

    en.wikipedia.org/wiki/Visual_pathway_lesions

    Lesions involving the whole optic nerve cause complete blindness on the affected side, that means damage at the right optic nerve causes complete loss of vision in the right eye. [3] Optic neuritis involving external fibers of the optic nerve causes tunnel vision. [4] Optic neuritis involving internal fibers of the optic nerve causes central ...

  6. Uhthoff's phenomenon - Wikipedia

    en.wikipedia.org/wiki/Uhthoff's_phenomenon

    Peripheral nerve studies have shown that even a 0.5 °C increase in body temperature can slow or block the conduction of nerve impulses in demyelinated nerves. With greater levels of demyelination, a smaller increase in temperature is needed to slow down the nerve impulse conduction. [ 8 ]

  7. Swinging light test - Wikipedia

    en.wikipedia.org/wiki/Swinging_light_test

    When the optic nerve is damaged, the sensory (afferent) stimulus sent to the midbrain is reduced. The pupil, responding less vigorously, dilates from its prior constricted state when the light is moved away from the unaffected eye and towards the affected eye. This response is a relative afferent pupillary defect (or Marcus Gunn pupil). [1]

  8. Health officials in Europe are investigating Ozempic and the trendy drug’s possible link to an eye-rotting condition that causes blindness. On Dec. 17, the European Medicines Agency announced ...

  9. Sensory loss - Wikipedia

    en.wikipedia.org/wiki/Sensory_loss

    Anosmia is the inability to perceive odor, or in other words a lack of functioning olfaction.Many patients may experience unilateral or bilateral anosmia. A temporary loss of smell can be caused by a blocked nose or infection. In contrast, a permanent loss of smell may be caused by death of olfactory receptor neurons in the nose or by brain injury in which there is damage to the

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