Ocular Motility Evaluation & Binocular Vision Assessment Flashcards
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Read the first 7 Ocular Motility Evaluation & Binocular Vision Assessment flashcards as text
The Titmus fly stereotest assesses stereoacuity at which approximate threshold level?
Answer: 3000 seconds of arc
The fly on the Titmus test represents gross stereopsis at approximately 3000 arcsec; the circles and animals test finer levels.
Convergence insufficiency is MOST reliably treated with:
Answer: Office-based vergence/accommodative therapy
The CITT study demonstrated that office-based vergence/accommodative therapy is significantly more effective than home-based pencil push-ups for symptomatic convergence insufficiency.
A patient with a head tilt to the right and a left hypertropia that increases on left head tilt has palsy of which muscle?
Answer: Right superior oblique
Left hypertropia increasing on left head tilt (positive Bielschowsky) and gaze right indicates right superior oblique palsy by Parks three-step.
The simultaneous prism and cover test (SPCT) measures:
Answer: Only the tropia component, excluding the phoria
SPCT applies the prism simultaneously with the cover so the eye does not refixate; it therefore measures only the manifest (tropia) component.
Which finding would EXCLUDE the diagnosis of monofixation syndrome?
Answer: Bifoveal stereoacuity of 40 arcsec
Fine bifoveal stereoacuity (≤60 arcsec) requires intact foveal binocular vision and is incompatible with the foveal suppression scotoma of monofixation syndrome.
In assessing ocular versions, limitation of elevation in adduction with no restriction on forced duction is consistent with:
Answer: Inferior oblique palsy
Inferior oblique palsy causes limitation of elevation in adduction (the IO's primary field) with negative forced duction, distinguishing it from Brown or restrictive causes.
The four-prism diopter base-out test is used to detect:
Answer: Microtropia and monofixation syndrome
The 4 PD BO test introduces a small fusional vergence demand; absence of the expected refixation movement indicates a central suppression scotoma, as seen in monofixation syndrome.