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Neuro-Ophthalmic Disorders & Visual Function Testing Flashcards

7 cards from real CO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Neuro-Ophthalmic Disorders & Visual Function Testing flashcards as text

  1. A 70-year-old presents with sudden painless vision loss in one eye described as a 'curtain coming down.' The most likely diagnosis is:

    Answer: Central retinal artery occlusion

    Sudden, painless, profound unilateral vision loss like a descending curtain is classic for central retinal artery occlusion.

  2. The Pulfrich phenomenon is a visual illusion resulting from:

    Answer: Asymmetric optic nerve conduction velocity causing stereoscopic depth illusion

    The Pulfrich phenomenon occurs when asymmetric optic nerve conduction (e.g., from optic neuritis) causes a pendulum to appear to swing in an ellipse.

  3. Which pattern of optic disc appearance is expected in a patient with longstanding increased intracranial pressure?

    Answer: Bilateral disc edema (papilledema)

    Papilledema—bilateral optic disc swelling—is the hallmark of raised intracranial pressure transmitted along the optic nerve sheaths.

  4. The Humphrey 24-2 visual field test uses a grid of test points separated by:

    Answer: 6 degrees

    The Humphrey 24-2 test pattern places test points on a 6-degree grid within the central 24 degrees of the visual field.

  5. Foster Kennedy syndrome consists of:

    Answer: Ipsilateral optic atrophy and contralateral papilledema from a frontal mass

    Foster Kennedy syndrome is caused by a frontal lobe or olfactory groove mass that directly compresses the ipsilateral optic nerve (causing atrophy) while raising ICP (causing contralateral papilledema).

  6. In testing color vision with Ishihara plates, which type of color deficiency is most commonly detected?

    Answer: Protan and deutan (red-green) deficiencies

    Ishihara plates are specifically designed to detect congenital red-green color deficiencies (protan and deutan types).

  7. A patient with myasthenia gravis is most likely to show which ocular motility pattern?

    Answer: Variable ptosis and ocular misalignment that worsens with fatigue

    Myasthenia gravis causes fatigable ptosis and variable ocular motility deficits that worsen with sustained effort due to acetylcholine receptor antibodies.