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Question: A patient with a 4Δ exophoria at near experiences asthenopia. The BEST diagnostic test to assess fusional reserves is:
A. Red lens test
B. Prism bar vergences
C. Maddox wing
D. Titmus stereo test
Answer: B. Prism bar vergence testing measures fusional convergence and divergence amplitudes. This directly assesses the patient’s ability to compensate for the phoria. Low fusional reserves explain asthenopia despite small deviation.
