Which tests are used in NAION evaluation?

Which tests are used in NAION evaluation?

• A. RNFL OCT, Visual Field (altitudinal or central), Pupils (APD), Red cap (reduced), ESR/CRP/CBC with diff (r/o GCA), BP, EOM
• B. Only OCT macula
• C. Blood glucose only
• D. Visual acuity test only

Answer: (A)

Evaluating NAION requires a broad battery of tests that document structural damage, assess functional vision, and rule out inflammatory or systemic causes that could mimic or worsen the condition. Structural imaging like RNFL OCT shows thinning of the retinal nerve fiber layer, which supports optic nerve injury from ischemia. Functional testing with visual fields often reveals altitudinal or central field defects typical of optic neuropathies. A pupil exam can reveal an afferent pupillary defect, indicating asymmetrical optic nerve function. The red-cap (color desaturation) test helps quantify color vision loss, which is commonly more pronounced in the affected eye. Systemic workup with ESR, CRP, and CBC aims to rule out giant cell arteritis, since arteritic AION requires urgent treatment. Measuring blood pressure and evaluating extraocular movements help assess vascular risk and exclude other neuro-ophthalmic conditions. Relying on a single test like macular OCT, blood glucose, or visual acuity would miss key diagnostic and management information, so a comprehensive approach is best.

Evaluating NAION requires a broad battery of tests that document structural damage, assess functional vision, and rule out inflammatory or systemic causes that could mimic or worsen the condition. Structural imaging like RNFL OCT shows thinning of the retinal nerve fiber layer, which supports optic nerve injury from ischemia. Functional testing with visual fields often reveals altitudinal or central field defects typical of optic neuropathies. A pupil exam can reveal an afferent pupillary defect, indicating asymmetrical optic nerve function. The red-cap (color desaturation) test helps quantify color vision loss, which is commonly more pronounced in the affected eye. Systemic workup with ESR, CRP, and CBC aims to rule out giant cell arteritis, since arteritic AION requires urgent treatment. Measuring blood pressure and evaluating extraocular movements help assess vascular risk and exclude other neuro-ophthalmic conditions. Relying on a single test like macular OCT, blood glucose, or visual acuity would miss key diagnostic and management information, so a comprehensive approach is best.