Outline a practical sequence for a basic ocular motility exam in a patient presenting with diplopia.

Outline a practical sequence for a basic ocular motility exam in a patient presenting with diplopia.

• A. Visual acuity; Cover test; Ductions; Versions; NPC; Vergence testing; Saccades and pursuits; Torsion assessment and diplopia mapping with prisms; Diagnostic tests (Worth 4-dot, Bagolini, Maddox rod).
• B. Visual field testing; Color vision testing; Slit-lamp examination; Fundus examination.
• C. Ocular fundus photography only.
• D. Choroidal thickness measurement.

Answer: (A)

In a patient with diplopia, the practical motility exam follows a logical flow from sensory baseline and alignment to detailed motor function and binocular testing. Start by establishing visual acuity to know what the patient is fixing on and to document any sensory limitation that might affect test results. A cover test then reveals whether there is a manifest deviation (tropia) or a latent one (phoria) and helps you gauge the general pattern of misalignment before you drill into specifics. Next, assess eye movements with ductions to isolate each eye’s ability to move, looking for any single-muscle restriction, and with versions to see how the eyes move together as a pair, which uncovers patterns of incomitancy or overaction in oblique or horizontal muscles. This pair of assessments is crucial because it helps distinguish where the problem lies—whether it’s a specific muscle limitation or a more global motility issue. Add near point of convergence and vergence testing to quantify the patient’s fusional ranges and convergence ability. This step is essential for understanding diplopia at different viewing distances and can point to convergence insufficiency or excess as an underlying contributor. Incorporate saccades and pursuits to evaluate the accuracy and speed of rapid eye movements and smooth tracking. These tests reveal central oculomotor control issues that might exist even when the extraocular muscles themselves appear to be functioning. Torsion assessment and diplopia mapping with prisms are valuable for identifying cyclovergence problems or torsional misalignments, which often accompany oblique muscle involvement. Using prisms to map diplopia provides a practical way to localize the deviation and understand how the double vision changes with eye position. Finish with binocular diagnostic tests such as Worth 4-dot, Bagolini, and Maddox rod to determine whether the diplopia is truly binocular, assess suppression versus fusion, and confirm the alignment status under different sensory conditions. This final step ties together the motor findings with the patient’s perceptual experience and helps guide management. The other options don’t fit this approach because they emphasize non-motility or peripheral testing (visual fields, color vision, slit-lamp, fundus examination, or even just fundus photography) or structural measurements (choroidal thickness) that don’t address the stepwise evaluation of binocular motility and diplopia.

In a patient with diplopia, the practical motility exam follows a logical flow from sensory baseline and alignment to detailed motor function and binocular testing. Start by establishing visual acuity to know what the patient is fixing on and to document any sensory limitation that might affect test results. A cover test then reveals whether there is a manifest deviation (tropia) or a latent one (phoria) and helps you gauge the general pattern of misalignment before you drill into specifics.

Next, assess eye movements with ductions to isolate each eye’s ability to move, looking for any single-muscle restriction, and with versions to see how the eyes move together as a pair, which uncovers patterns of incomitancy or overaction in oblique or horizontal muscles. This pair of assessments is crucial because it helps distinguish where the problem lies—whether it’s a specific muscle limitation or a more global motility issue.

Add near point of convergence and vergence testing to quantify the patient’s fusional ranges and convergence ability. This step is essential for understanding diplopia at different viewing distances and can point to convergence insufficiency or excess as an underlying contributor.

Incorporate saccades and pursuits to evaluate the accuracy and speed of rapid eye movements and smooth tracking. These tests reveal central oculomotor control issues that might exist even when the extraocular muscles themselves appear to be functioning.

Torsion assessment and diplopia mapping with prisms are valuable for identifying cyclovergence problems or torsional misalignments, which often accompany oblique muscle involvement. Using prisms to map diplopia provides a practical way to localize the deviation and understand how the double vision changes with eye position.

Finish with binocular diagnostic tests such as Worth 4-dot, Bagolini, and Maddox rod to determine whether the diplopia is truly binocular, assess suppression versus fusion, and confirm the alignment status under different sensory conditions. This final step ties together the motor findings with the patient’s perceptual experience and helps guide management.

The other options don’t fit this approach because they emphasize non-motility or peripheral testing (visual fields, color vision, slit-lamp, fundus examination, or even just fundus photography) or structural measurements (choroidal thickness) that don’t address the stepwise evaluation of binocular motility and diplopia.